year of first registration
| Value label | Value | Absolute frequency | Relative frequency |
|---|---|---|---|
| pre 1970 | 1969 | 82 | 0.48% |
| 1970s | 1979 | 74 | 0.44% |
| 1980s | 1989 | 101 | 0.6% |
| 1990 | 1990 | 21 | 0.12% |
| 1991 | 1991 | 26 | 0.15% |
| 1992 | 1992 | 21 | 0.12% |
| 1993 | 1993 | 32 | 0.19% |
| 1994 | 1994 | 28 | 0.17% |
| 1995 | 1995 | 44 | 0.26% |
| 1996 | 1996 | 68 | 0.4% |
| 1997 | 1997 | 153 | 0.9% |
| 1998 | 1998 | 175 | 1.03% |
| 1999 | 1999 | 262 | 1.55% |
| 2000 | 2000 | 393 | 2.32% |
| 2001 | 2001 | 572 | 3.38% |
| 2002 | 2002 | 798 | 4.71% |
| 2003 | 2003 | 1018 | 6.01% |
| 2004 | 2004 | 1154 | 6.81% |
| 2005 | 2005 | 1285 | 7.58% |
| 2006 | 2006 | 1306 | 7.71% |
| 2007 | 2007 | 1464 | 8.64% |
| 2008 | 2008 | 1307 | 7.71% |
| 2009 | 2009 | 1237 | 7.3% |
| 2010 | 2010 | 1269 | 7.49% |
| 2011 | 2011 | 1132 | 6.68% |
| 2012 | 2012 | 1184 | 6.99% |
| 2013 | 2013 | 875 | 5.16% |
| 2014 | 2014 | 356 | 2.1% |
| 2015 | 2015 | 137 | 0.81% |
| 2016 | 2016 | 139 | 0.82% |
| 2017 | 2017 | 130 | 0.77% |
| 2018 | 2018 | 101 | 0.6% |
| 2019 | 2019 | 3 | 0.02% |
| Total | 16947 | 100.0% |
