Year	Number of
1990	27528.48
1991	27859.42
1992	28132.49
1993	28652.3
1994	29116.42
1995	29187.12
1996	29539.09
1997	29425.02
1998	29750.84
1999	30006.75
2000	29957.01
2001	29479.21
2002	29471.9
2003	30060.15
2004	29206.15
2005	29176.49
2006	29769.14
2007	30049.23
2008	30266.66
2009	30787.79
2010	30885.23
2011	30875.29
2012	30831.58
2013	30368.66
2014	30671.92
2015	31033.19
2016	31463.39