Year	Number
1996	19.5652179718018
1998	16.3043479919434
2000	24.456521987915
2002	29.7297306060791
2003	37.8378372192383
2004	46.766170501709
2005	30.3921566009521
2006	35.294116973877
2007	45.6310691833496
2008	50.4854354858398
2009	50.7177047729492
2010	50.2392349243164
2011	52.1327018737793
2012	51.6587677001953
2013	50.2369651794434
2014	50.480770111084
2015	46.6666679382324
2016	48.5714302062988
2017	50.476188659668
2018	47.1428565979004
2019	48.5714302062988
2020	44.761905670166
2021	46.1904754638672
2022	45.7547187805176