Year	Number
1996	26.6304340362549
1998	32.0652160644531
2000	24.456521987915
2002	34.5945930480957
2003	36.2162170410156
2004	38.8059692382813
2005	34.3137245178223
2006	32.8431358337402
2007	31.5533981323242
2008	34.4660186767578
2009	34.9282302856445
2010	35.8851661682129
2011	35.5450248718262
2012	31.2796211242676
2013	31.2796211242676
2014	31.730770111084
2015	30
2016	30.4761905670166
2017	30.4761905670166
2018	30.4761905670166
2019	27.1428565979004
2020	24.761905670166
2021	24.2857151031494
2022	21.2264156341553