Year	Number of
1990	240.23
1991	249.18
1992	260.3
1993	272.51
1994	285.93
1995	300.11
1996	322.88
1997	346.91
1998	376.08
1999	409.93
2000	450.77
2001	493.65
2002	547.32
2003	615.06
2004	690.3
2005	772.2
2006	835.41
2007	898.06
2008	967.62
2009	1051.2
2010	1156.46
2011	1240.59
2012	1343.81
2013	1462.01
2014	1578.31
2015	1684.73
2016	1810.17