Year	Number
1996	33.5
1998	27.8606967926025
2000	29.3532333374023
2002	26.8656711578369
2003	25.3731346130371
2004	23.0769233703613
2005	22.5961532592773
2006	16.8269233703613
2007	15.865385055542
2008	17.3076915740967
2009	14.6919431686401
2010	15.6398105621338
2011	17.3708915710449
2012	15.023473739624
2013	14.5539903640747
2014	13.7931032180786
2015	12.8078813552856
2016	12.8078813552856
2017	12.8078813552856
2018	13.1067962646484
2019	12.5603866577148
2020	14.4927539825439
2021	13.043478012085
2022	8.21256065368652