Year	Number
1960	20078
1961	20907
1962	21753
1963	22631
1964	23541
1965	24482
1966	25513
1967	26650
1968	27865
1969	29130
1970	30444
1971	31848
1972	33319
1973	34897
1974	36570
1975	38311
1976	40181
1977	42176
1978	44287
1979	46406
1980	48457
1981	50603
1982	52876
1983	55217
1984	57614
1985	59997
1986	62457
1987	65052
1988	67772
1989	70596
1990	73573
1991	76768
1992	80101
1993	83523
1994	86975
1995	90381
1996	93874
1997	97503
1998	101198
1999	105002
2000	109033
2001	113308
2002	117830
2003	122601
2004	127528
2005	132614
2006	137818
2007	143175
2008	148724
2009	154580
2010	160890
2011	167851
2012	175423
2013	183376
2014	191379
2015	199201
2016	207261
2017	215749
2018	224464
2019	233383
2020	242686
2021	251072
2022	258855
2023	269209