Year	Number
1996	21.1956520080566
1998	16.8478260040283
2000	21.7391300201416
2002	16.2162170410156
2003	17.8378372192383
2004	17.412935256958
2005	20.5882358551025
2006	17.6470584869385
2007	16.5048542022705
2008	17.9611644744873
2009	20.0956935882568
2010	19.1387557983398
2011	20.8530807495117
2012	22.274881362915
2013	26.5402851104736
2014	25.480770111084
2015	25.7142848968506
2016	23.8095245361328
2017	27.619047164917
2018	17.1428565979004
2019	16.1904754638672
2020	13.8095235824585
2021	12.8571424484253
2022	17.4528293609619