Year	%
1997	8
1998	6.8
1999	8
2000	12.38
2001	13.95
2002	13.77
2003	12.05
2004	11.76
2005	15.04
2006	16.29
2007	17.74
2008	22.12
2009	26.06
2010	24.96
2011	23.97
2012	23.31
2013	24.61
2015	29.06
2016	30.74
2017	31.39
2018	29.99
2019	31
2020	30.67
2021	31.41