| Spring Survey | |||||||||
| Age | Year | n | Numerical Index | Biomass Index | |||||
| LCI | Index | UCI | LCI | Index | UCI | ||||
| All | 2007 | ||||||||
| 2008 | 150 | 1.34 | 1.95 | 2.73 | 0.13 | 0.21 | 0.29 | ||
| 2009 | 160 | 1.72 | 2.45 | 3.39 | 0.24 | 0.36 | 0.48 | ||
| 2010 | 150 | 1.53 | 2.29 | 3.27 | 0.14 | 0.23 | 0.33 | ||
| 2011 | 150 | 1.03 | 1.64 | 2.45 | 0.13 | 0.26 | 0.41 | ||
| 2012 | 150 | 0.63 | 1.15 | 1.82 | 0.08 | 0.16 | 0.25 | ||
| 2013 | 150 | 0.93 | 1.46 | 2.13 | 0.14 | 0.22 | 0.31 | ||
| 2014 | 150 | 2.22 | 3.39 | 4.97 | 0.34 | 0.50 | 0.69 | ||
| 2015 | 150 | 1.72 | 2.80 | 4.31 | 0.27 | 0.45 | 0.65 | ||
| 2016 | 150 | 2.28 | 3.45 | 5.03 | 0.24 | 0.38 | 0.54 | ||
| 2017 | 63 | 0.02 | 0.30 | 0.65 | 0.00 | 0.05 | 0.10 | ||
| 2018 | 150 | 0.87 | 1.28 | 1.79 | 0.05 | 0.09 | 0.14 | ||
| 2019 | 149 | 2.53 | 3.74 | 5.37 | 0.14 | 0.23 | 0.33 | ||
| 2020 | |||||||||
| 2021 | 150 | 3.02 | 4.52 | 6.57 | 0.29 | 0.43 | 0.59 | ||
| 2022 | 150 | 1.10 | 1.62 | 2.26 | 0.08 | 0.13 | 0.19 | ||
| 2023 | |||||||||
| 2024 | |||||||||
| 2025 | |||||||||
| 1 | 2007 | ||||||||
| 2008 | 150 | 1.11 | 1.65 | 2.33 | 0.10 | 0.16 | 0.24 | ||
| 2009 | 160 | 1.08 | 1.60 | 2.24 | 0.13 | 0.20 | 0.29 | ||
| 2010 | 150 | 1.28 | 1.96 | 2.84 | 0.11 | 0.20 | 0.29 | ||
| 2011 | 150 | 0.78 | 1.32 | 2.04 | 0.09 | 0.21 | 0.35 | ||
| 2012 | 150 | 0.58 | 1.07 | 1.72 | 0.07 | 0.16 | 0.24 | ||
| 2013 | 150 | 0.78 | 1.25 | 1.84 | 0.12 | 0.19 | 0.27 | ||
| 2014 | 150 | 0.96 | 1.61 | 2.47 | 0.15 | 0.27 | 0.40 | ||
| 2015 | 150 | 1.38 | 2.33 | 3.65 | 0.23 | 0.40 | 0.59 | ||
| 2016 | 150 | 1.87 | 2.87 | 4.21 | 0.19 | 0.32 | 0.46 | ||
| 2017 | 63 | 0.00 | 0.25 | 0.58 | 0.00 | 0.04 | 0.09 | ||
| 2018 | 150 | 0.80 | 1.20 | 1.69 | 0.04 | 0.08 | 0.12 | ||
| 2019 | 149 | 2.50 | 3.70 | 5.32 | 0.14 | 0.23 | 0.32 | ||
| 2020 | |||||||||
| 2021 | 150 | 2.44 | 3.72 | 5.48 | 0.24 | 0.38 | 0.52 | ||
| 2022 | 150 | 0.88 | 1.33 | 1.89 | 0.05 | 0.10 | 0.15 | ||
| 2023 | |||||||||
| 2024 | |||||||||
| 2025 | |||||||||