| Date | Value |
|---|---|
| Dec 1, 2023 | 4.58% |
| Jan 1, 2023 | 3.81% |
| Jan 1, 2022 | 2.15% |
| Jan 1, 2021 | 1.63% |
| Jan 1, 2020 | 2.07% |
| Jan 1, 2019 | 2.89% |
| Jan 1, 2018 | 2.73% |
| Jan 1, 2017 | 2.75% |
| Jan 1, 2016 | 2.49% |
| Jan 1, 2015 | 2.20% |
| Jan 1, 2014 | 3.52% |
| Jan 1, 2013 | 2.68% |
| Jan 1, 2012 | 2.69% |
| Jan 1, 2011 | 4.28% |
| Jan 1, 2010 | 4.50% |
| Jan 1, 2009 | 3.46% |
| Jan 1, 2008 | 4.35% |
| Jan 1, 2007 | 4.95% |
| Jan 1, 2006 | 4.65% |
| Jan 1, 2005 | 4.77% |
| Jan 1, 2004 | 5.01% |
| Jan 1, 2003 | 5.02% |
| Jan 1, 2002 | 5.69% |
| Jan 1, 2001 | 5.65% |
| Jan 1, 2000 | 6.86% |
| Jan 1, 1999 | 5.45% |
| Jan 1, 1998 | 5.88% |
| Jan 1, 1997 | 6.91% |
| Jan 1, 1996 | 6.11% |
| Jan 1, 1995 | 7.97% |
| Jan 1, 1994 | 6.39% |