Year	Number
1996	80.17
1997	118.79
1998	93.16
1999	93.02
2000	124.53
2001	141.39
2002	127.16
2003	132.85
2004	134.89
2005	176.01
2006	193.89
2007	259.41
2008	292.41
2009	323.4
2010	354.53
2011	460.6
2012	475.94
2013	460.99
2014	473.21
2015	505.97
2016	472.58
2017	478.99
2018	447.14
2019	422.87
2020	427.34