| 2018 | 2019 | 250,000 | 346,000 | 596,000 | 0 | 250,000 | 346,000 | 596,000 |
| 2017 | 2018 | 220,000 | 303,000 | 523,000 | 0 | 220,000 | 303,000 | 523,000 |
| 2016 | 2017 | 197,000 | 243,000 | 440,000 | 0 | 197,000 | 243,000 | 440,000 |
| 2015 | 2016 | 190,000 | 240,000 | 430,000 | 0 | 190,000 | 240,000 | 430,000 |
| 2014 | 2015 | 175,000 | 221,000 | 396,000 | 0 | 175,000 | 221,000 | 396,000 |
| 2013 | 2014 | 172,000 | 166,000 | 338,000 | 0 | 172,000 | 166,000 | 338,000 |
| 2012 | 2013 | 167,000 | 161,000 | 328,000 | 0 | 167,000 | 161,000 | 328,000 |
| 2011 | 2012 | 172,000 | 164,000 | 336,000 | 0 | 172,000 | 164,000 | 336,000 |
| 2010 | 2011 | 182,000 | 177,000 | 359,000 | 0 | 182,000 | 177,000 | 359,000 |
| 2009 | 2010 | 182,000 | 171,000 | 353,000 | 0 | 182,000 | 171,000 | 353,000 |
| 2008 | 2009 | 215,000 | 216,000 | 431,000 | 0 | 215,000 | 216,000 | 431,000 |
| 2007 | 2008 | 138,000 | 253,000 | 391,000 | 0 | 138,000 | 253,000 | 391,000 |
| 2006 | 2007 | 128,000 | 233,000 | 361,000 | 0 | 128,000 | 233,000 | 361,000 |
| 2005 | 2006 | 124,000 | 212,000 | 336,000 | 0 | 124,000 | 212,000 | 336,000 |
| 2004 | 2005 | 120,000 | 204,000 | 324,000 | 0 | 120,000 | 204,000 | 324,000 |
| 2003 | 2004 | 115,000 | 200,000 | 315,000 | 0 | 115,000 | 200,000 | 315,000 |
| 2002 | 2003 | 115,000 | 200,000 | 315,000 | 0 | 115,000 | 200,000 | 315,000 |
| 2001 | 2002 | 100,000 | 205,000 | 305,000 | 133,000 | 100,000 | 205,000 | 305,000 |
| 2000 | 2001 | 64,000 | 111,000 | 175,000 | 133,000 | 64,000 | 111,000 | 175,000 |
| 1999 | 2000 | 28,000 | 0 | 28,000 | 28,000 | 28,000 | 0 | 28,000 |
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