Year	maximum value in 2004 = 100
2006	26.2532922859
2007	24.5301450704
2008	26.8908012031
2009	28.7453415033
2010	32.819830414
2011	32.0675842188
2012	35.3682511215
2013	35.9761737992
2014	39.331980584
2015	48.725885378
2016	47.9400141875
2017	47.3219536384
2018	45.7317350558
2019	48.6031387639
2020	49.3657872982
2021	49.2294559589