1975	160.86	4.085
1976	124.74	4.347
1977	147.84	4.706
1978	193.40	5.930
1979	306	21.793
1980	615	16.393
1981	460	8.432
1982	376	10.586
1983	424	9.121
1984	361	6.694
1985	317	5.888
1986	368	5.364
1987	447	6.790
1988	437	6.108
1989	381	5.543
1990	383.51	4.068
1991	362.11	3.909
1992	343.82	3.710
1993	359.77	4.968
1994	384	4.769
1995	383.79	5.148
1996	387.81	4.730
1997	331.02	5.945
1998	294.24	5.549
1999	278.11	5.218
2000	279.11	4.9506
2001	271.04	4.3702
2002	309.73	4.5995
2003	363.38	4.8758
2004	409.72	6.6711
2005	444.74	7.3164
2006	603.46	11.5452
2007	695.39	13.3836
2008	871.96	14.9891
2009	972.35	14.6733
2010	1224.53	20.1928
2011	1571.52	35.1192
2012	1668.98	31.1497
2013	1411.23	23.7928
2014	1266.40	19.0778
2015	1159.72	15.68
2016	1249.84 17.14
2017	1243.28	17.15