Jaar	Invoer	Uitvoer	Totaal
2009	278.408	283.253	561.661
2008	278.911	281.615	560.526
2007	323.683	326.759	650.442
2006	326.134	328.195	654.329
2005	351.749	350.737	702.486
2004	324.684	325.160	649.844
2003	337.286	336.867	674.153
2002	389.334	384.248	773.582
2001	348.790	344.328	693.118
2000	328.622	322.461	651.083
1999	325.871	315.831	641.702
1998	320.567	310.348	630.915
1997	342.178	321.800	663.978
1996	331.876	299.866	631.742
1995	532.168	507.895	1.040.063
1994	586.641	565.032	1.151.673
1993	554.537	528.968	1.083.505
1992	585.365	572.410	1.157.775
1991	809.351	865.614	1.674.965
1990	839.444	891.286	1.730.730
1989	782.799	825.472	1.608.271
1988	572.221	574.735	1.146.956
1987	840.019	860.604	1.700.623
1986	869.600	902.816	1.772.416
1985	974.689	989.522	1.964.211
1984	1.038.397	1.058.046	2.096.443
1983	1.001.677	1.021.685	2.023.362
1982	1.097.695	1.106.423	2.204.118
1981	1.153.602	1.156.192	2.309.794
1980	1.143.171	1.170.660	2.313.831
1979	846.898	844.414	1.691.312
1978	872.420	860.368	1.732.788
1977	805.586	800.341	1.605.927
1976	679.383	664.815	1.344.198
1975	593.241	577.015	1.170.256
1974	446.352	438.088	884.440
1973	400.488	380.520	781.008
1972	359.267	342.350	701.617
1971	279.554	251.314	530.868
1970	271.818	238.664	510.482
1969	205.609	173.651	379.260
1968	144.985	110.911	255.896
1967	74.765	54.676	129.441
1966	27.228	19.795	47.023
1965	7.566	7.403	14.969
1964	3.348	2.847	6.195