| Table 3. Estimated stock numbers at age. | ||||||
| Year Age | 1 | 2 | 3 | 4 | 5 | 6 |
| 1992 | 306 | 90 | 148 | 162 | 148 | 206 |
| 1993 | 293 | 236 | 70 | 114 | 125 | 269 |
| 1994 | 196 | 228 | 183 | 54 | 89 | 303 |
| 1995 | 197 | 152 | 178 | 142 | 42 | 303 |
| 1996 | 217 | 151 | 116 | 139 | 110 | 265 |
| 1997 | 250 | 167 | 115 | 89 | 108 | 289 |
| 1998 | 326 | 192 | 128 | 88 | 67 | 308 |
| 1999 | 386 | 251 | 147 | 99 | 68 | 291 |
| 2000 | 423 | 296 | 194 | 113 | 77 | 277 |
| 2001 | 401 | 320 | 226 | 149 | 85 | 270 |
| 2002 | 256 | 303 | 242 | 170 | 114 | 268 |
| 2003 | 419 | 193 | 231 | 183 | 127 | 292 |
| 2004 | 168 | 324 | 146 | 179 | 141 | 317 |
| 2005 | 259 | 128 | 249 | 111 | 137 | 348 |
| 2006 | 268 | 201 | 97 | 195 | 85 | 368 |
| 2007 | 325 | 208 | 157 | 75 | 151 | 345 |
| 2008 | 529 | 249 | 161 | 122 | 57 | 383 |
| 2009 | 228 | 409 | 189 | 124 | 94 | 336 |
| 2010 | 254 | 174 | 317 | 142 | 94 | 328 |
| 2011 | 179 | 197 | 134 | 247 | 108 | 322 |
| 2012 | 262 | 137 | 151 | 104 | 191 | 330 |
| 2013 | 363 | 205 | 105 | 116 | 80 | 402 |
| 2014 | 280 | 279 | 159 | 80 | 89 | 371 |
| 2015 | 210 | 218 | 214 | 123 | 61 | 353 |
| 2016 | 230 | 160 | 168 | 162 | 94 | 316 |
| 2017 | 382 | 175 | 122 | 130 | 122 | 312 |
| 2018 | 374 | 294 | 134 | 92 | 100 | 330 |
| 2019 | 264 | 289 | 225 | 103 | 70 | 327 |