Year	Number
1998	9.39264
1999	9.90644
2000	9.69221
2001	9.90224
2002	10.14622
2003	9.82366
2004	9.66316
2005	9.69107
2014	8.70334
2015	8.35042
2016	8.04983
2017	8.19168
2018	7.77961