| Year | % Change in the number of inspections relative to 2005 | % Change in the number of contraventions relative to 2005 |
| 2006 | −37.34% | −81.95% |
| 2007 | −38.97% | −65.39% |
| 2008 | +6.58% | +12.74% |
| 2009 | +38.25% | +9.13% |
| 2010 | +0.47% | +21.23% |
| 2011 | +40.19% | +88.44% |
| 2012 | +44.53% | +70.40% |
| 2013 | +30.03% | +20.67% |
| 2014 | −19.44% | −30.82% |
| 2015 | −14.52% | −50.09% |