Year	Number
1996	21.5
1998	31.343282699585
2000	38.8059692382813
2002	56.2189064025879
2003	52.2388076782227
2004	51.9230766296387
2005	52.8846168518066
2006	58.6538467407227
2007	61.538459777832
2008	61.0576934814453
2009	63.5071105957031
2010	61.6113739013672
2011	62.4413146972656
2012	60.0938949584961
2013	62.9107971191406
2014	60.0985221862793
2015	61.0837440490723
2016	58.1280784606934
2017	57.1428565979004
2018	53.8834953308105
2019	52.1739120483398
2020	50.7246360778809
2021	49.7584533691406
2022	51.6908226013184