Year	Number
1996	16.8478260040283
1998	22.8260860443115
2000	21.1956520080566
2002	22.1621627807617
2003	23.7837829589844
2004	24.8756217956543
2005	40.1960792541504
2006	30.3921566009521
2007	30.5825233459473
2008	36.4077682495117
2009	33.0143547058105
2010	32.0574150085449
2011	31.7535552978516
2012	29.8578205108643
2013	30.8056869506836
2014	25.9615383148193
2015	25.238094329834
2016	25.7142848968506
2017	26.1904754638672
2018	26.1904754638672
2019	25.238094329834
2020	21.9047622680664
2021	24.2857151031494
2022	23.1132068634033