Year	%
1997	35.37
1999	37.98
2000	22.7
2001	21.73
2002	17.97
2003	16.63
2004	18.74
2005	19.28
2006	15.22
2007	16
2008	15.39
2009	13.87
2010	16.12
2012	14.98
2013	15.05
2018	46.42
2019	71.93
2020	18.43
2021	17.05