Year	Total
1971	48.72
1972	50.15
1973	50.15
1974	51.58
1975	53.01
1976	54.45
1977	55.88
1978	57.31
1979	58.74
1980	60.18
1981	61.61
1982	63.04
1983	64.48
1984	65.91
1985	68.77
1986	426.6
1987	1006
1988	8046
1989	9056
1990	9384
1991	10320
1992	8929
1993	10950
1994	16950
1995	17290
1996	17470
1997	18280
1998	18630
1999	19740
2000	22030
2001	22100
2002	22230
2003	21910
2004	20640
2005	20450
2006	18730
2007	16520
2008	15270
2009	15220