Year	Number of
1990	452.07
1991	463.48
1992	483.06
1993	497.27
1994	522.12
1995	528.49
1996	537.01
1997	543.59
1998	555.26
1999	570.05
2000	573.82
2001	579.77
2002	589.14
2003	601.42
2004	618.09
2005	641.12
2006	648.43
2007	655.65
2008	671.67
2009	689.88
2010	712.15
2011	722.61
2012	737.43
2013	749.9
2014	756.65
2015	768.4
2016	783.91