Year	Number
1961	44.892749623682896
1962	52.650830753679955
1963	61.031589652323134
1964	68.01413922680084
1965	84.86104813111356
1966	88.55208603265095
1967	98.86076777189197
1968	111.93121519816573
1969	127.5973252118644
1970	148.81428950159065
1971	165.81241655540722
1972	187.79372136890328
1973	215.6783783783784
1974	247.0624492007586
1975	271.4423922603342
1976	294.00731558626296
1977	320.6547255580433
1978	349.7586511659528
1979	391.1745836745837
1980	423.6050885712332
1981	461.46017089305406
1982	490.33347141673573
1983	523.202293768136
1984	554.8613691090471
1985	637.2007442629729
1986	683.1697045015189
1987	720.6553867403316
1988	761.3827433628319
1989	799.6697655057583
1990	823.603002502085
1991	820.8635097493037
1992	817.5629490130431
1993	807.8294302691367
1994	916.5664335664335
1995	928.4926108374384
1996	930.3827477863468
1997	935.6704269598744
1998	932.2828484029309
1999	927.7359295054008
2000	933.8240548845852
2001	963.2803297997643
2002	1048.8693312836278
2003	1089.489155477874
2004	1082.791435368755
2005	1183.743513713862
2006	1208.9966041397154
2007	1313.8712678677155
2008	1300.6227684131861
2009	1307.2186308635835