Year Percent 2010-01-01 3.1371 2011-01-01 3.1338 2012-01-01 3.0966 2013-01-01 3.0859 2014-01-01 2.9972 2015-01-01 2.7977 2016-01-01 2.6189 2017-01-01 2.5505 2018-01-01 2.5107 2019-01-01 2.4778 2020-01-01 2.4421 2021-01-01 2.4073 2022-01-01 2.3741 2023-01-01 2.3412