Traffic Totals by Year |
| Year |
Number of Vehicles |
| 1956 | 3,808,382 |
| 1957 | 4,023,818 |
| 1958 | 3,825,259 |
| 1959 | 4,026,221 |
| 1960 | 4,276,633 |
| 1961 | 4,616,556 |
| 1962 | 4,807,942 |
| 1963 | 4,979,855 |
| 1964 | 5,405,894 |
| 1965 | 5,976,041 |
| 1966 | 6,494,353 |
| 1967 | 6,823,940 |
| 1968 | 7,559,764 |
| 1969 | 8,413,496 |
| 1970 | 9,282,000 |
| 1971 | 10,437,778 |
| 1972 | 11,540,176 |
| 1973 | 12,511,960 |
| 1974 | 11,860,802 |
| 1975 | 12,617,563 |
| 1976 | 13,942,384 |
| 1977 | 15,355,564 |
| 1978 | 16,476,298 |
| 1979 | 16,190,821 |
| 1980 | 16,518,484 |
| 1981 | 17,390,489 |
| 1982 | 18,765,683 |
| 1983 | 19,088,885 |
| 1984 | 20,939,430 |
| 1985 | 24,915,940 |
| 1986 | 28,567,492 |
| 1987 | 32,009,712 |
| 1988 | 35,194,234 |
| 1989 | 36,211,254 |
| 1990 | 36,685,839 |
| 1991 | 36,522,383 |
| 1992 | 38,165,506 |
| 1993 | 39,404,332 |
| 1994 | 41,847,074 |
| 1995 | 43,739,014 |
| 1996 | 44,584,360 |
| 1997 | 45,741,534 |
| 1998 | 47,784,836 |
| 1999 | 51,946,294 |
| 2000 | 54,660,791 |
| 2001 | 55,686,078 |
| 2002 | 57,766,111 |
| 2003 | 60,670,705 |
| 2004 | 62,415,805 |
| 2005 | 62,045,393 |
| 2006 | 63,184,410 |
| 2007 | 63,387,400 |
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