Year % 2000 2.253702 2001 0.2635542 2005 2.858335 2006 2.751004 2007 3.588645 2015 3.432765 2016 1.350242 2017 1.343988 2018 1.506631 2019 1.225277 2020 0.0839787 2021 0.082313