| Year | Lake total phosphorus 1992-2021 (265) | Lake total phosphorus 2000-2021 (341) | River phosphate 1992-2021 (417) (secondary axis) | River phosphate 2000-2021 (693) (secondary axis) |
|---|---|---|---|---|
| 1992 | 0.034 | 0.109 | ||
| 1993 | 0.035 | 0.106 | ||
| 1994 | 0.033 | 0.097 | ||
| 1995 | 0.032 | 0.087 | ||
| 1996 | 0.029 | 0.095 | ||
| 1997 | 0.029 | 0.08 | ||
| 1998 | 0.028 | 0.073 | ||
| 1999 | 0.029 | 0.075 | ||
| 2000 | 0.028 | 0.029 | 0.075 | 0.094 |
| 2001 | 0.027 | 0.028 | 0.077 | 0.092 |
| 2002 | 0.031 | 0.031 | 0.076 | 0.093 |
| 2003 | 0.029 | 0.03 | 0.079 | 0.097 |
| 2004 | 0.027 | 0.027 | 0.077 | 0.086 |
| 2005 | 0.027 | 0.027 | 0.067 | 0.076 |
| 2006 | 0.025 | 0.026 | 0.081 | 0.088 |
| 2007 | 0.023 | 0.024 | 0.08 | 0.091 |
| 2008 | 0.025 | 0.027 | 0.068 | 0.081 |
| 2009 | 0.028 | 0.028 | 0.064 | 0.078 |
| 2010 | 0.025 | 0.026 | 0.065 | 0.073 |
| 2011 | 0.022 | 0.024 | 0.05 | 0.059 |
| 2012 | 0.023 | 0.024 | 0.052 | 0.066 |
| 2013 | 0.023 | 0.024 | 0.053 | 0.058 |
| 2014 | 0.023 | 0.024 | 0.051 | 0.059 |
| 2015 | 0.02 | 0.021 | 0.055 | 0.061 |
| 2016 | 0.02 | 0.021 | 0.056 | 0.06 |
| 2017 | 0.02 | 0.021 | 0.061 | 0.064 |
| 2018 | 0.021 | 0.022 | 0.06 | 0.063 |
| 2019 | 0.02 | 0.021 | 0.064 | 0.067 |
| 2020 | 0.021 | 0.023 | 0.074 | 0.076 |
| 2021 | 0.02 | 0.023 | 0.07 | 0.07 |