Year	Number
1996	17.36
1997	20.76
1998	22.28
1999	22.84
2000	27.07
2001	39.6
2002	37.81
2003	44.48
2004	61.34
2005	58.83
2006	85.76
2007	85.67
2008	69.03
2009	63.74
2010	67.88
2011	64.93
2012	64.66
2013	81.72
2014	116
2015	99.27
2016	164.18
2017	136.65
2018	159.49
2019	154.94
2020	175.92