1998平成101.681.651.38 1999平成111.631.631.34 2000平成121.671.651.36 2001平成131.641.61.33 2002平成141.611.571.32 2003平成151.581.541.29 2004平成161.541.511.29 2005平成171.511.491.26 2006平成181.521.491.32 2007平成191.571.491.34 2008平成201.661.521.37 2009平成211.531.491.37 2010平成221.661.521.39 2011平成231.571.481.39 2012平成241.561.411.41 2013平成251.51.531.43 2014平成261.671.581.42 2015平成271.581.581.45 2016平成281.511.591.44 2017平成291.561.571.43 2018平成301.511.531.42 2019令和元1.431.471.36 2020令和21.511.391.33 2021令和31.411.361.3 2022令和41.321.271.26 2023令和51.261.211.2