Year	Number
1996	25
1998	22.8260860443115
2000	23.9130439758301
2002	28.1081085205078
2003	27.5675678253174
2004	28.3582096099854
2005	34.3137245178223
2006	26.470588684082
2007	25.2427177429199
2008	29.1262130737305
2009	30.6220092773438
2010	31.5789470672607
2011	33.1753540039063
2012	38.3886260986328
2013	40.2843589782715
2014	31.730770111084
2015	34.761905670166
2016	34.2857131958008
2017	33.3333320617676
2018	35.7142868041992
2019	35.238094329834
2020	30.9523811340332
2021	31.9047622680664
2022	29.7169818878174