| Spring Survey | |||||||||
| Age | Year | n | Numerical Index | Biomass Index | |||||
| LCI | Index | UCI | LCI | Index | UCI | ||||
| All | 2007 | ||||||||
| 2008 | 150 | 1.93 | 2.47 | 3.11 | 0.17 | 0.21 | 0.26 | ||
| 2009 | 160 | 1.14 | 1.51 | 1.94 | 0.09 | 0.14 | 0.18 | ||
| 2010 | 150 | 1.32 | 1.77 | 2.30 | 0.12 | 0.18 | 0.24 | ||
| 2011 | 150 | 1.20 | 1.67 | 2.23 | 0.16 | 0.24 | 0.32 | ||
| 2012 | 150 | 1.67 | 2.05 | 2.47 | 0.15 | 0.19 | 0.23 | ||
| 2013 | 150 | 2.94 | 3.68 | 4.56 | 0.24 | 0.30 | 0.36 | ||
| 2014 | 150 | 1.04 | 1.49 | 2.04 | 0.11 | 0.18 | 0.24 | ||
| 2015 | 150 | 1.57 | 2.19 | 2.97 | 0.15 | 0.24 | 0.34 | ||
| 2016 | 150 | 2.46 | 3.15 | 3.98 | 0.23 | 0.30 | 0.36 | ||
| 2017 | 63 | 0.11 | 0.29 | 0.49 | 0.00 | 0.03 | 0.05 | ||
| 2018 | 150 | 0.77 | 1.07 | 1.41 | 0.06 | 0.10 | 0.14 | ||
| 2019 | 149 | 1.95 | 2.67 | 3.56 | 0.14 | 0.22 | 0.31 | ||
| 2020 | |||||||||
| 2021 | 150 | 2.45 | 3.33 | 4.43 | 0.19 | 0.26 | 0.34 | ||
| 2022 | 150 | 1.32 | 1.83 | 2.45 | 0.11 | 0.17 | 0.22 | ||
| 2023 | |||||||||
| 2024 | |||||||||
| 2025 | |||||||||