Year	maximum value in 2004 = 100
2006	12.5008891838
2007	12.9533967059
2008	11.3364336526
2009	13.1561646677
2010	12.3230045911
2011	12.8477415505
2012	13.4454181531
2013	14.0836182217
2014	14.0202181328
2015	12.9948131214
2016	14.2237901089
2017	13.8940937838
2018	12.5299385489
2019	11.8126667731
2020	11.9877307171
2021	11.7956863332