Year	Number
1996	21.8579235076904
1998	39.8907089233398
2000	38.2513656616211
2002	34.0540542602539
2003	37.8378372192383
2004	38.3084564208984
2005	32.8431358337402
2006	28.2926826477051
2007	33.980583190918
2008	35.9223289489746
2009	34.9282302856445
2010	32.0574150085449
2011	31.2796211242676
2012	31.7535552978516
2013	30.8056869506836
2014	31.730770111084
2015	32.3809509277344
2016	32.3809509277344
2017	30.4761905670166
2018	32.3809509277344
2019	32.3809509277344
2020	29.5238094329834
2021	31.4285717010498
2022	31.6037731170654