Year	Number
1996	29.5
1998	38.8059692382813
2000	41.2935333251953
2002	48.2587051391602
2003	50.2487564086914
2004	49.038459777832
2005	51.4423065185547
2006	49.038459777832
2007	51.9230766296387
2008	53.3653831481934
2009	54.028434753418
2010	54.028434753418
2011	52.1126747131348
2012	50.7042236328125
2013	51.1737098693848
2014	50.2463035583496
2015	52.709358215332
2016	52.2167472839355
2017	54.1871910095215
2018	52.9126205444336
2019	52.1739120483398
2020	51.2077293395996
2021	50.2415466308594
2022	52.1739120483398