Year	Number
1993	21.55081
1994	19.85
1995	19.89325
1996	20.0836
1999	23.72564
2000	21.71065
2001	27.20557
2003	28.10908
2008	29.81904
2010	24.76389
2011	23.03909
2012	22.72188
2013	22.90667
2014	23.00687
2015	22.79732
2016	23.53968
2017	24.16483
2019	24.86179