This graph shows the annual declining phosphorous loads. There was a sharp and steady decline starting in 1990 when phosphorous restrictions began. In 1989, sewage treatment began, creating a further decline in the tons per year. 3he y–axis shows tons of [phosphorus] per year.
| Year | Tons per year |
|---|---|
| 1985 | 1,400 |
| 1986 | 1,300 |
| 1987 | 1,400 |
| 1988 | 1,200 |
| 1989 | 1,300 |
| 1990 | 1,350 |
| 1991 | 900 |
| 1992 | 700 |
| 1993 | 400 |
Note, the numbers are estimates based on visual study of the line graphs.