Year	Number
1996	13.5
1998	15.4228858947754
2000	17.9104480743408
2002	23.8805961608887
2003	23.8805961608887
2004	21.634614944458
2005	21.1538467407227
2006	16.8269233703613
2007	16.8269233703613
2008	15.384614944458
2009	15.1658763885498
2010	13.2701425552368
2011	13.6150236129761
2012	14.5539903640747
2013	12.6760559082031
2014	13.3004922866821
2015	10.837438583374
2016	7.88177347183228
2017	7.88177347183228
2018	7.76699018478394
2019	6.7632851600647
2020	5.31400966644287
2021	8.69565200805664
2022	8.69565200805664