Year	Number
1996	51.5
1998	53.7313423156738
2000	43.7810935974121
2002	47.2636833190918
2003	43.7810935974121
2004	40.8653831481934
2005	36.538459777832
2006	37.980770111084
2007	43.269229888916
2008	40.3846168518066
2009	39.3364944458008
2010	38.8625602722168
2011	37.0892028808594
2012	38.4976539611816
2013	40.3755874633789
2014	39.9014778137207
2015	39.4088668823242
2016	38.4236450195313
2017	40.8866996765137
2018	46.6019401550293
2019	47.8260879516602
2020	45.4106292724609
2021	51.6908226013184
2022	48.7922706604004