Year	Number
1996	21.1055278778076
1998	23.5
2000	32.3383102416992
2002	34.3283576965332
2003	32.3383102416992
2004	34.1346168518066
2005	33.0143547058105
2006	29.6650714874268
2007	32.0574150085449
2008	28.8461532592773
2009	17.5355453491211
2010	12.3222751617432
2011	13.1455402374268
2012	10.3286380767822
2013	11.7370891571045
2014	14.9038457870483
2015	17.619047164917
2016	11.9047622680664
2017	11.4285717010498
2018	13.8095235824585
2019	8.5714282989502
2020	12.8571424484253
2021	11.9047622680664
2022	12.2641506195068