| 2017 | 2018 | 311,000 | 670,000 | 981,000 | 311,000 | 670,000 | 981,000 |
| 2016 | 2017 | 285,000 | 613,000 | 898,000 | 285,000 | 613,000 | 898,000 |
| 2015 | 2016 | 269,000 | 576,000 | 845,000 | 269,000 | 576,000 | 845,000 |
| 2014 | 2015 | 259,000 | 602,000 | 861,000 | 259,000 | 602,000 | 861,000 |
| 2013 | 2014 | 226,000 | 525,000 | 751,000 | 226,000 | 525,000 | 751,000 |
| 2012 | 2013 | 211,000 | 496,000 | 707,000 | 211,000 | 496,000 | 707,000 |
| 2011 | 2012 | 268,000 | 506,000 | 774,000 | 268,000 | 506,000 | 774,000 |
| 2010 | 2011 | 280,000 | 526,000 | 806,000 | 280,000 | 526,000 | 806,000 |
| 2009 | 2010 | 303,000 | 573,000 | 876,000 | 303,000 | 573,000 | 876,000 |
| 2008 | 2009 | 303,000 | 720,000 | 1,023,000 | 303,000 | 720,000 | 1,023,000 |
| 2007 | 2008 | 273,000 | 649,000 | 922,000 | 273,000 | 649,000 | 922,000 |
| 2006 | 2007 | 260,000 | 587,000 | 847,000 | 260,000 | 587,000 | 847,000 |
| 2005 | 2006 | 244,000 | 653,000 | 897,000 | 244,000 | 653,000 | 897,000 |
| 2004 | 2005 | 231,000 | 627,000 | 858,000 | 231,000 | 627,000 | 858,000 |
| 2003 | 2004 | 220,000 | 595,000 | 815,000 | 220,000 | 595,000 | 815,000 |
| 2002 | 2003 | 211,000 | 569,000 | 780,000 | 211,000 | 569,000 | 780,000 |
| 2001 | 2002 | 192,000 | 555,000 | 747,000 | 192,000 | 555,000 | 747,000 |
| 2000 | 2001 | 175,000 | 435,000 | 610,000 | 175,000 | 435,000 | 610,000 |
| 1999 | 2000 | 128,000 | 372,000 | 500,000 | 128,000 | 372,000 | 500,000 |
| 1998 | 1999 | 116,000 | 407,000 | 523,000 | 116,000 | 407,000 | 523,000 |
| 1997 | 1998 | 0 | 0 | 0 | 116,000 | 343,000 | 459,000 |
| 1996 | 1997 | 0 | 0 | 0 | 90,000 | 343,100 | 433,100 |
| 1995 | 1996 | 0 | 0 | 0 | 90,000 | 343,100 | 433,100 |
| 1994 | 1995 | 0 | 0 | 0 | 90,000 | 0 | 90,000 |
| 1992 | 1993 | 0 | 0 | 0 | 113,100 | 0 | 113,100 |
| 1990 | 1991 | 0 | 0 | 0 | 105,400 | 0 | 105,400 |
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