Year	Total
1960	1.72
1961	4.902
1962	3.87
1963	0.172
1964	6.45
1965	8.514
1966	7.74
1967	8.342
1968	8.428
1969	7.31
1970	8.256
1971	4.73
1972	5.59
1973	4.042
1974	7.138
1975	6.106
1976	3.956
1977	24.26
1978	24.2
1979	26.12
1980	29.42
1981	30.28
1982	28.66
1983	28.4
1984	30.91
1985	30.67
1986	26.1
1987	33.74
1988	36.56
1989	35.15
1990	28.8
1991	30.51
1992	45.59
1993	44.19
1994	45.32
1995	44.56
1996	37.38
1997	42.5
1998	53.08
1999	53.44
2000	57.28
2001	58.21
2002	56.07
2003	58.12
2004	66.66
2005	88.32
2006	91.87
2007	94.62
2008	101.3
2009	106.1
2010	104