Year	Number
1996	57.89
1997	71.69
1998	70.26
1999	84.71
2000	100.09
2001	94.91
2002	83.03
2003	104.24
2004	135.8
2005	146.5
2006	134.43
2007	153.62
2008	199.88
2009	158.35
2010	231.98
2011	268.35
2012	297.45
2013	248.28
2014	237.93
2015	268.49
2016	275.48
2017	262.88
2018	312.09
2019	336.85
2020	453.27