Year	Number
1996	8826.61
1997	9009.03
1998	9409.54
1999	9244.92
2000	9593.02
2001	9951.02
2002	10242.87
2003	10826.98
2004	11463.48
2005	12642.34
2006	12916.17
2007	13561.83
2008	14232.84
2009	14702.07
2010	14984.64
2011	15533.91
2012	16204.15
2013	16428.55
2014	16694.78
2015	16448.59
2016	16513.99
2017	16037.22
2018	16172.65
2019	16218.32
2020	17015.55