Year	Number
1996	33.6956520080566
1998	28.8043479919434
2000	29.8913040161133
2002	25.9459457397461
2003	22.7027034759521
2004	19.9004974365234
2005	22.5490188598633
2006	23.529411315918
2007	25.2427177429199
2008	28.1553401947021
2009	29.6650714874268
2010	30.6220092773438
2011	32.2274894714355
2012	27.488151550293
2013	28.9099521636963
2014	28.365385055542
2015	29.0476188659668
2016	31.9047622680664
2017	30.4761905670166
2018	30.4761905670166
2019	28.0952377319336
2020	30.9523811340332
2021	33.3333320617676
2022	29.2452831268311