| Year | Moran’s I Index | Z Value |
| 2008 | −0.084 | −2.344 |
| 2009 | −0.077 | −2.208 |
| 2010 | −0.086 | −2.291 |
| 2011 | 0.018 | 1.195 |
| 2012 | 0.017 | 2.189 |
| 2013 | 0.068 | 2.485 |
| 2014 | 0.036 | 1.038 |
| 2015 | 0.04 | 2.409 |
| 2016 | 0.082 | 3.861 |
| 2017 | 0.08 | 2.058 |
| 2018 | 1.212 | 3.133 |
| 2019 | 1.297 | 2.510 |
| 2020 | 1.288 | 2.227 |