Year	Number
1960	14693
1961	15194
1962	15685
1963	16191
1964	16733
1965	17289
1966	17960
1967	18627
1968	19285
1969	20232
1970	21879
1971	23541
1972	24702
1973	25345
1974	25842
1975	26089
1976	26279
1977	26530
1978	26654
1979	26635
1980	26676
1981	26875
1982	27112
1983	27289
1984	27399
1985	27399
1986	27375
1987	27405
1988	27426
1989	27441
1990	27567
1991	27807
1992	28089
1993	28443
1994	28866
1995	29197
1996	29451
1997	29854
1998	30345
1999	30804
2000	31250
2001	31631
2002	31907
2003	32047
2004	32082
2005	32043
2006	31864
2007	31645
2008	31492
2009	31342
2010	31330
2011	31476
2012	31647
2013	31829
2014	31972
2015	31724
2016	31375
2017	31017
2018	30667
2019	30356
2020	30019
2021	29585
2022	29090
2023	28587