Year	Number of
1990	26503.63
1991	27075.72
1992	27564.29
1993	27996.51
1994	28462.19
1995	28817.59
1996	29454.2
1997	30226.7
1998	30692.39
1999	31125.16
2000	31609.09
2001	32044.32
2002	32529.58
2003	33001.36
2004	33469.71
2005	34309.82
2006	34730.48
2007	35338.34
2008	35979.01
2009	36552
2010	37271.17
2011	37869.19
2012	38432.24
2013	38928.33
2014	39275.77
2015	39885.43
2016	40507.08