Year	Number
1996	42.2110557556152
1998	46.5
2000	37.3134346008301
2002	38.8059692382813
2003	33.8308448791504
2004	39.9038467407227
2005	29.6650714874268
2006	38.2775115966797
2007	35.4067001342773
2008	31.25
2009	31.2796211242676
2010	30.3317527770996
2011	33.8028182983398
2012	34.7417831420898
2013	30.9859161376953
2014	35.5769233703613
2015	32.3809509277344
2016	34.761905670166
2017	31.9047622680664
2018	33.8095245361328
2019	32.3809509277344
2020	36.1904754638672
2021	34.761905670166
2022	40.5660362243652