Year Percent change 1994 1.194 1995 2.163 1996 2.406 1997 2.914 1998 8.128 1999 0.169 2000 3 2001 2.291 2002 1.588 2003 4.19 2004 3.317 2005 2.7 2006 5.2 2007 4.278 2008 6.563 2009 6.843 2010 3.597 2011 6.353 2012 2.548 2013 3.427 2014 0.081 2015 1.581 2016 3.931 2017 2.814 2018 4.876 2019 3.5 2020 3 2021 3 2022 3 2023 3 2024 3