Year	Number
1970	13116
1971	14651
1972	14796
1973	16293
1974	17579
1975	18558
1976	20406
1989	17089
1990	15106
1993	16160
1994	20055
1998	32593
1999	26385
2006	110313
2007	110312
2008	113763
2009	115454
2010	118858
2011	121593
2012	129093
2013	130957
2015	142880
2016	140529
2017	132347
2018	134145
2019	135751