401 Ground transportation	402 Air transportation	403 Water transportation	407 Other transportation
1947	1,686	857	-248	0
1948	2,301	879	2,676	0
1949	2,833	888	2,708	0
1950	3,153	1,009	2,836	0
1951	2,740	964	1,813	0
1952	2,724	980	3,025	0
1953	3,253	916	3,236	0
1954	3,293	1,045	2,619	0
1955	3,607	998	2,614	0
1956	4,252	977	2,281	0
1957	5,267	1,147	1,911	0
1958	8,299	1,601	1,992	0
1959	13,698	2,470	2,180	0
1960	15,263	2,808	2,512	0
1961	13,726	3,491	2,774	0
1962	13,744	3,766	3,154	0
1963	14,564	3,846	3,270	0
1964	17,339	3,928	3,161	0
1965	18,795	4,045	3,425	0
1966	18,159	3,978	3,226	0
1967	17,761	4,144	3,434	0
1968	18,484	4,025	3,572	0
1969	17,869	4,219	3,499	0
1970	17,782	4,695	3,463	0
1971	18,533	5,856	3,802	0
1972	18,193	5,884	3,862	0
1973	18,450	6,426	4,126	0
1974	17,426	6,979	4,236	178
1975	18,387	6,811	4,126	209
1976	25,366	6,686	4,074	172
1977	25,127	6,846	4,278	187
1978	23,987	7,458	4,109	140
1979	25,769	7,136	4,188	198
1980	29,836	7,272	4,354	203
1981	30,404	6,792	4,240	196
1982	23,833	5,868	4,472	150
1983	22,740	6,376	4,733	158
1984	24,841	6,788	4,628	131
1985	26,202	7,285	4,764	204
1986	27,212	7,683	5,761	203
1987	24,256	7,807	4,895	129
1988	24,854	8,076	4,261	159
1989	23,668	8,733	3,846	164
1990	24,091	9,194	4,005	186
1991	23,911	10,012	3,851	273
1992	24,257	11,103	4,088	291
1993	24,744	11,701	3,986	327
1994	27,286	11,564	4,158	380
1995	28,220	11,178	4,163	336
1996	28,053	11,085	3,784	350
1997	28,745	10,876	3,813	300
1998	27,508	11,236	3,713	211
1999	29,292	11,194	3,701	225
2000	32,429	10,815	4,496	196
2001	35,843	14,367	4,731	279