|
| Z Value | P-Value for Upward Trend | P-Value for Downward Trend | Trend |
| 2000 | 0.07 | 0.47 | 0.52 | Decreasing |
| 2001 | 0.28 | 0.39 | 0.61 | Decreasing |
| 2002 | −1.26 | 0.90 | 0.10 | No Trend |
| 2003 | −1.48 | 0.93 | 0.07 | No Trend |
| 2004 | 0.74 | 0.80 | 0.20 | Increasing |
| 2005 | 0.89 | 0.19 | 0.81 | Increasing |
| 2006 | 0.34 | 0.37 | 0.63 | Decreasing |
| 2007 | −2.53 | 0.99 | 0.01 | No Trend |
| 2008 | 0.37 | 0.33 | 0.88 | Decreasing |
| 2009 | 0.65 | 0.45 | 0.69 | Decreasing |
| 2010 | 0.34 | 0.54 | 0.77 | Decreasing |