Year	Number
1996	34.042552947998
1998	34.5744667053223
2000	36.5079383850098
2002	31.7460308074951
2003	38.6934661865234
2004	34.4660186767578
2005	33.980583190918
2006	40.0966186523438
2007	37.1980667114258
2008	34.1346168518066
2009	32.7014236450195
2010	29.8578205108643
2011	22.274881362915
2012	15.6398105621338
2013	10.4265403747559
2014	10
2015	9.0476188659668
2016	8.5714282989502
2017	9.0476188659668
2018	11.3207550048828
2019	11.7924528121948
2020	15.0943393707275
2021	11.3207550048828
2022	14.1509437561035