Year	Number
1996	3514.48
1997	3905.61
1998	4342.56
1999	3982.13
2000	4411.53
2001	4347.95
2002	4628.75
2003	4636.83
2004	4857.73
2005	5572.92
2006	5566.75
2007	5841.51
2008	6432.62
2009	5998.04
2010	5891.47
2011	6395.73
2012	6445.62
2013	6211.44
2014	6611.54
2015	6524.89
2016	6425.46
2017	6646.45
2018	6684.52
2019	7129.81
2020	7478.17