Year % 2005 5.49714794462969 2006 4.71376501614093 2007 5.02978436420467 2008 6.18532915178467 2009 7.77269432606176 2010 7.46687394928383 2011 6.08582301927461 2012 5.16922182642368 2013 4.44172210232602 2014 3.71124356449484 2015 2.90028545437363 2016 2.50312498405707 2017 2.21548567130651 2018 2.03976381631607 2019 1.87312600792251 2020 1.47436336364664 2021 1.18544081793544 2022 1.07012161776376 2023 1.81395597726592