Year % 2001 22.3261273136135 2002 28.913047032939428 2003 20.86170410473683 2004 17.18312231119004 2005 15.023007485486477 2006 16.838079724285667 2007 17.43258849993912 2008 16.06228828640929 2009 19.697333617291363 2010 18.748122872982524 2011 14.526496933650948 2012 20.138878882532467 2013 19.437319277572104 2014 15.162188459363596 2015 15.848488714287413 2016 14.124706586597982 2017 16.074398204225208 2018 22.159166944078702 2019 63.82973561994043 2020 59.54186629329161 2021 71.35062076451408 2022 68.00783275561804 2023 49.819685982944165