Year	Number
2002	16.996941896
2003	19.344648318
2004	21.6923547401
2005	24.0400611621
2006	24.7870725605
2007	25.5351403948
2008	26.2826800111
2009	27.0281067556
2010	27.775118154
2011	28.5221295524
2012	29.2691409508
2013	30.0161523492
2014	30.7631637476
2015	31.510175146
2016	32.2629969419
2017	32.2571865443
2018	32.2571865443
2019	32.2571865443
2020	32.2571865443