Year	Number
1996	31.6582908630371
1998	33.5
2000	30.8457717895508
2002	33.8308448791504
2003	36.8159217834473
2004	34.1346168518066
2005	30.6220092773438
2006	42.1052627563477
2007	41.1483268737793
2008	37.980770111084
2009	32.7014236450195
2010	33.1753540039063
2011	35.6807518005371
2012	40.3755874633789
2013	41.7840385437012
2014	46.6346168518066
2015	44.761905670166
2016	45.238094329834
2017	45.7142868041992
2018	47.1428565979004
2019	45.238094329834
2020	47.1428565979004
2021	39.0476188659668
2022	39.1509437561035