Year	Number
1995	11583544.705829557
1996	13088654.204097895
1997	13456245.973343946
1998	14403851.832546368
1999	15309377.842034195
2000	15353177.301304992
2001	15854696.28600283
2002	17383375.415747426
2003	17844385.282023642
2004	18745951.162755266
2005	19917566.3729011
2006	22650320.879912134
2007	25114898.436753795
2008	25413098.26745147
2009	25964418.069538254
2010	29071500.511440605
2011	31650243.884142708
2012	32748552.390675176
2013	34426632.679692656
2014	35738392.214013554
2015	35318681.46454987
2016	37645887.77446596
2017	38258347.87559703
2018	41189145.26870986
2019	39826701.40254885