Year	Number
1996	35.6783905029297
1998	37
2000	38.8059692382813
2002	38.3084564208984
2003	31.8407955169678
2004	26.9230766296387
2005	29.1866035461426
2006	25.3588523864746
2007	28.2296657562256
2008	10.5769233703613
2009	23.6966819763184
2010	20.8530807495117
2011	18.7793426513672
2012	17.8403759002686
2013	15.4929580688477
2014	19.230770111084
2015	18.0952377319336
2016	25.238094329834
2017	30.4761905670166
2018	25.7142848968506
2019	28.5714282989502
2020	30
2021	25.238094329834
2022	25.4716987609863