Year	%
1998	0.73
1999	0.67
2000	0.78
2001	0.58
2002	0.75
2003	1.26
2004	0.9
2005	0.76
2006	0.59
2007	0.98
2015	0.99
2016	1.13
2017	1.37
2018	0.91