Year	maximum value in 2004 = 100
2006	69.5864249693
2007	77.2297030006
2008	76.8098710975
2009	72.0344575485
2010	79.2695365183
2011	88.3767401614
2012	86.9966737015
2013	89.8119428857
2014	88.846569291
2015	91.9699559937
2016	90.9429842287
2017	92.892826081
2018	93.9117056901
2019	98.1785160836
2020	99.5042950989
2021	98.6806336759