Yearly occurrence of G scale
| Year | G5 | G4 | G3 | G2 | G1 |
| 1996 | 0 | 0 | 2 | 2 | 44 |
| 1997 | 0 | 0 | 5 | 14 | 33 |
| 1998 | 0 | 6 | 8 | 41 | 66 |
| 1999 | 0 | 2 | 5 | 16 | 88 |
| 2000 | 1 | 8 | 16 | 46 | 95 |
| 2001 | 0 | 9 | 23 | 29 | 79 |
| 2002 | 0 | 1 | 12 | 35 | 66 |
| 2003 | 3 | 10 | 18 | 48 | 219 |
| 2004 | 0 | 13 | 18 | 23 | 50 |
| 2005 | 0 | 4 | 20 | 37 | 86 |
| 2006 | 0 | 1 | 3 | 11 | 40 |
| 2007 | 0 | 0 | 0 | 0 | 23 |
| 2008 | 0 | 0 | 0 | 2 | 17 |
| 2009 | 0 | 0 | 0 | 0 | 4 |
| 2010 | 0 | 0 | 1 | 4 | 17 |