Year	Total
1965	6449
1966	8598
1967	7051
1968	7653
1969	8169
1970	7567
1971	8255
1972	9458
1973	8684
1974	6965
1975	14020
1976	14190
1977	12810
1978	11870
1979	12550
1980	9630
1981	14450
1982	13670
1983	13330
1984	15560
1985	13330
1986	13240
1987	14530
1988	14530
1989	13590
1990	15310
1991	16680
1992	13590
1993	14270
1994	13840
1995	14020
1996	17800
1997	18570
1998	13330
1999	15560
2000	15310
2001	15990
2002	16680
2003	14700
2004	17630
2005	17370
2006	15990
2007	18060
2008	18310
2009	19600
2010	16170
2011	19090