Year	Number
1996	16.3043479919434
1998	14.6739130020142
2000	10.3260869979858
2002	14.0540542602539
2003	21.0810813903809
2004	19.4029846191406
2005	22.5490188598633
2006	20.0980396270752
2007	18.4466018676758
2008	17.9611644744873
2009	16.7464122772217
2010	16.2679424285889
2011	17.0616111755371
2012	12.7962083816528
2013	11.8483409881592
2014	9.61538505554199
2015	11.9047622680664
2016	11.4285717010498
2017	11.9047622680664
2018	11.4285717010498
2019	11.9047622680664
2020	10.9523811340332
2021	14.2857141494751
2022	16.0377349853516