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WQI classification (%) for the Putrajaya Lake from 2011–2019 (Adapted from (BAHAGIAN ALAM SEKITAR, TASIK DAN WETLAND PERBADANAN PUTRAJAYA. http://plwmos.ppj.gov.my/. Accessed 5 May 2020b)
| Year | Class | ||
|---|---|---|---|
| I | II | III | |
| 2011 | 67.0% | 33.0% | |
| 2012 | 40.0% | 60.0% | |
| 2013 | 8.0% | 91.0% | 1.0% |
| 2014 | 6.1% | 93.9% | |
| 2015 | 12.7% | 87.3% | |
| 2016 | 14.7% | 85.3% | |
| 2017 | 12.3% | 87.7% | |
| 2018 | 4.9% | 95.1% | |
| 2019 | 15.7% | 84.3% | |
