Year	Number
1996	22.5
1998	29.8507461547852
2000	28.8557205200195
2002	19.9004974365234
2003	11.9402980804443
2004	10.5769233703613
2005	19.7115383148193
2006	19.7115383148193
2007	16.8269233703613
2008	20.1923084259033
2009	19.9052124023438
2010	15.6398105621338
2011	16.9014091491699
2012	14.5539903640747
2013	7.0422534942627
2014	8.86699485778809
2015	13.7931032180786
2016	19.2118225097656
2017	17.2413787841797
2018	14.5631065368652
2019	14.9758453369141
2020	13.5265703201294
2021	15.4589376449585
2022	15.4589376449585