Year	Number
1996	35.5
1998	15.4228858947754
2000	15.9203977584839
2002	30.348258972168
2003	32.3383102416992
2004	28.8461532592773
2005	23.5576915740967
2006	20.6730766296387
2007	19.7115383148193
2008	21.634614944458
2009	23.222749710083
2010	24.6445503234863
2011	23.0046939849854
2012	20.1877937316895
2013	22.5352115631104
2014	21.674877166748
2015	24.630542755127
2016	22.660099029541
2017	22.660099029541
2018	21.3592224121094
2019	18.8405799865723
2020	19.8067626953125
2021	20.2898559570313
2022	21.7391300201416