Year	Number
1960	47294
1961	49881
1962	52618
1963	55396
1964	58097
1965	60815
1966	63828
1967	67215
1968	70887
1969	74402
1970	76681
1971	77908
1972	78989
1973	79872
1974	80425
1975	80529
1976	80317
1977	79985
1978	79539
1979	79031
1980	78542
1981	78390
1982	78619
1983	79023
1984	79790
1985	80869
1986	81947
1987	82933
1988	83908
1989	85019
1990	86058
1991	87113
1992	88705
1993	90720
1994	92467
1995	93781
1996	94850
1997	95786
1998	96651
1999	97119
2000	97156
2001	97048
2002	97070
2003	97234
2004	97349
2005	97470
2006	97671
2007	97856
2008	98115
2009	98672
2010	98538
2011	97387
2012	96117
2013	94532
2014	92898
2015	91398
2016	89672
2017	87804
2018	85888
2019	83942
2020	81971
2021	80042
2022	78154
2023	76291