| Year | Number |
|---|---|
| 2018 | 1,096,611 |
| 2017 | 1,127,167 |
| 2016 | 1,183,505 |
| 2015 | 1,051,031 |
| 2014 | 1,016,518 |
| 2013 | 990,553 |
| 2012 | 1,031,631 |
| 2011 | 1,062,040 |
| 2010 | 1,042,625 |
| 2009 | 1,130,818 |
| 2008 | 1,107,126 |
| 2007 | 1,052,415 |
| 2006 | 1,266,129 |
| 2005 | 1,122,257 |
| 2004 | 957,883 |
| 2003 | 703,542 |
| 2002 | 1,059,356 |
| 2001 | 1,058,902 |
| 2000 | 841,002 |
| 1999 | 644,787 |
| 1998 | 653,206 |
| 1997 | 797,847 |
| 1996 | 915,560 |
| 1995 | 720,177 |
| 1994 | 803,993 |
| 1993 | 903,916 |
| 1992 | 973,445 |
| 1991 | 1,826,595 |
| 1990 | 1,535,872 |
| 1989 | 1,090,172 |
| 1988 | 641,346 |
| 1987 | 599,889 |
| 1986 | 600,027 |
| 1985 | 568,149 |
| 1984 | 541,811 |
| 1983 | 550,052 |
| 1982 | 533,624 |
| 1981 | 595,014 |
| 1980 | 524,295 |
| 1979 | 394,244 |
| 1978 | 589,810 |
| 1977 | 458,755 |
| 1976¹ | 499,093 |
| 1975 | 385,378 |
| 1974 | 393,919 |
| 1973 | 398,515 |
| 1972 | 384,685 |
| 1971 | 370,478 |
| 1970 | 373,326 |
| 1969 | 358,579 |
| 1968 | 454,448 |
| 1967 | 361,972 |
| 1966 | 323,040 |
| 1965 | 296,697 |
| 1964 | 292,248 |
| 1963 | 306,260 |
| 1962 | 283,763 |
| 1961 | 271,344 |
| 1960 | 265,398 |
| 1959 | 260,686 |
| 1958 | 253,265 |
| 1957 | 326,867 |
| 1956 | 321,625 |
| 1955 | 237,790 |
| 1954 | 208,177 |
| 1953 | 170,434 |
| 1952 | 265,520 |
| 1951 | 205,717 |
| 1950 | 249,187 |
| 1949 | 188,317 |
| 1948 | 170,570 |
| 1947 | 147,292 |
| 1946 | 108,721 |
| 1945 | 38,119 |
| 1944 | 28,551 |
| 1943 | 23,725 |
| 1942 | 28,781 |
| 1941 | 51,776 |
| 1940 | 70,756 |
| 1939 | 82,998 |
| 1938 | 67,895 |
| 1937 | 50,244 |
| 1936 | 36,329 |
| 1935 | 34,956 |
| 1934 | 29,470 |
| 1933 | 23,068 |
| 1932 | 35,576 |
| 1931 | 97,139 |
| 1930 | 241,700 |
| 1929 | 279,678 |
| 1928 | 307,255 |
| 1927 | 335,175 |
| 1926 | 304,488 |
| 1925 | 294,314 |
| 1924 | 706,896 |
| 1923 | 522,919 |
| 1922 | 309,556 |
| 1921 | 805,228 |
| 1920 | 430,001 |
| 1919 | 141,132 |
| 1918 | 110,618 |
| 1917 | 295,403 |
| 1916 | 298,826 |
| 1915 | 326,700 |
| 1914 | 1,218,480 |
| 1913 | 1,197,892 |
| 1912 | 838,172 |
| 1911 | 878,587 |
| 1910 | 1,041,570 |
| 1909 | 751,786 |
| 1908 | 782,870 |
| 1907 | 1,285,349 |
| 1906 | 1,100,735 |
| 1905 | 1,026,499 |
| 1904 | 812,870 |
| 1903 | 857,046 |
| 1902 | 648,743 |
| 1901 | 487,918 |
| 1900 | 448,572 |
| 1899 | 311,715 |
| 1898 | 229,299 |
| 1897 | 230,832 |
| 1896 | 343,267 |
| 1895 | 258,536 |
| 1894 | 285,631 |
| 1893 | 439,730 |
| 1892 | 579,663 |
| 1891 | 560,319 |
| 1890 | 455,302 |
| 1889 | 444,427 |
| 1888 | 546,889 |
| 1887 | 490,109 |
| 1886 | 334,203 |
| 1885 | 395,346 |
| 1884 | 518,592 |
| 1883 | 603,322 |
| 1882 | 788,992 |
| 1881 | 669,431 |
| 1880 | 457,257 |
| 1879 | 177,826 |
| 1878 | 138,469 |
| 1877 | 141,857 |
| 1876 | 169,986 |
| 1875 | 227,498 |
| 1874 | 313,339 |
| 1873 | 459,803 |
| 1872 | 404,806 |
| 1871 | 321,350 |
| 1870 | 387,203 |
| 1869 | 352,768 |
| 1868 | 138,840 |
| 1867 | 315,722 |
| 1866 | 318,568 |
| 1865 | 248,120 |
| 1864 | 193,418 |
| 1863 | 176,282 |
| 1862 | 91,985 |
| 1861 | 91,918 |
| 1860 | 153,640 |
| 1859 | 121,282 |
| 1858 | 123,126 |
| 1857 | 251,306 |
| 1856 | 200,436 |
| 1855 | 200,877 |
| 1854 | 427,833 |
| 1853 | 368,645 |
| 1852 | 371,603 |
| 1851 | 379,466 |
| 1850 | 369,980 |
| 1849 | 297,024 |
| 1848 | 226,527 |
| 1847 | 234,968 |
| 1846 | 154,416 |
| 1845 | 114,371 |
| 1844 | 78,615 |
| 1843 | 52,496 |
| 1842 | 104,565 |
| 1841 | 80,289 |
| 1840 | 84,066 |
| 1839 | 68,069 |
| 1838 | 38,914 |
| 1837 | 79,340 |
| 1836 | 76,242 |
| 1835 | 45,374 |
| 1834 | 65,365 |
| 1833 | 58,640 |
| 1832 | 60,482 |
| 1831 | 22,633 |
| 1830 | 23,322 |
| 1829 | 22,520 |
| 1828 | 27,382 |
| 1827 | 18,875 |
| 1826 | 10,837 |
| 1825 | 10,199 |
| 1824 | 7,912 |
| 1823 | 6,354 |
| 1822 | 6,911 |
| 1821 | 9,127 |
| 1820 | 8,385 |
¹ Includes the 15 months from July 1, 1975 to September 30, 1976 because the end date of fiscal years was changed from June 30 to September 30.
Source: U.S. Department of Homeland Security.
