Year	Number
1996	13385.05
1997	13803.62
1998	14004
1999	14202.82
2000	14569.85
2001	14742.17
2002	14576.2
2003	14858.19
2004	15323.94
2005	16494.16
2006	16796.09
2007	16690.04
2008	16646.7
2009	17467.59
2010	17762.17
2011	18276.99
2012	19207.32
2013	19812.61
2014	20741.1
2015	20851.1
2016	20820.51
2017	20754.74
2018	20825.36
2019	20969.01
2020	21880.49