Year	Number
1996	11499.01
1997	11877.96
1998	11985.86
1999	11964.4
2000	12621.43
2001	12297.66
2002	12478.85
2003	13163.19
2004	14175.81
2005	15462.68
2006	16469.77
2007	16882.92
2008	17350.51
2009	17905.64
2010	18709.05
2011	19755.56
2012	20769.07
2013	21302.67
2014	21788.24
2015	21848.15
2016	21982.57
2017	22442.37
2018	22189.21
2019	22336.94
2020	23075.04