Year	Number
1971	14424
1972	15553
1973	16579
1974	16351
1975	18688
1976	20134
1977	23937
1978	27371
1979	31601
1980	34467
1981	39474
1982	42197
1983	43898
1984	43157
1985	42462
1988	37439
1989	37894
1990	37932
1991	38933
1992	39637
1993	38743
1994	37676
1995	39713
1996	44145
1998	40591
1999	42678
2000	46051
2001	49413
2002	50700
2003	55309
2004	64270
2005	67137
2006	76831
2007	78743
2008	85257
2009	90265
2010	105673
2011	99551
2012	102229
2013	112734
2014	110528
2015	115640
2016	116577
2017	120351
2018	122097
2019	126649
2020	129008
2021	133272
2022	133704