Year	Number of
1990	506.45
1991	535.91
1992	568.94
1993	605.61
1994	642.76
1995	677.48
1996	710.34
1997	740.64
1998	770.36
1999	796.59
2000	825.24
2001	848.76
2002	871.3
2003	895.52
2004	927.27
2005	961.29
2006	1000.82
2007	1037.87
2008	1076.12
2009	1113.33
2010	1151.26
2011	1190.64
2012	1234.61
2013	1281.62
2014	1328.93
2015	1376.38
2016	1426.78