Year Number 1996 -0.00557905901223421 1998 0.033033475279808 2000 0.103345222771168 2002 1.11161923408508 2003 0.826036751270294 2004 1.03947734832764 2005 0.990808546543121 2006 0.885872542858124 2007 1.00609827041626 2008 1.07145047187805 2009 0.906304717063904 2010 0.890833914279938 2011 1.07048761844635 2012 1.15573620796204 2013 1.27358639240265 2014 1.19904685020447 2015 1.03483545780182 2016 1.13127934932709 2017 1.09514439105988 2018 1.11653625965118 2019 1.07211112976074 2020 1.08254373073578 2021 1.15014326572418 2022 1.15533649921417