Year	Index
1983-01-01	25.9
1985-01-01	26.9
1988-01-01	28.8
1991-01-01	27.6
1995-01-01	32.9
2000-01-01	33.4
2005-01-01	33.2
2010-01-01	32.1
2016-01-01	32.4