| Years | Simulated number of contractors | Actual number of contractors |
| 1991 | 2,899 | 2,899 | 1992 | 3,335 | 3,236 | 1993 | 3,880 | 3,724 | 1994 | 4,660 | 4,490 | 1995 | 5,331 | 5,233 | 1996 | 6,281 | 6,158 | 1997 | 7,256 | 7,178 | 1998 | 8,457 | 8,464 | 1999 | 9,306 | 9,360 | 2000 | 10,528 | 10,606 | 2001 | 10,903 | 10,941 | 2002 | 13,139 | 13,254 | 2003 | 12,211 | 12,638 | 2004 | 8,900 | 8,822 | 2005 | 8,991 | 8,979 | 2006 | 9,146 | 9,089 | 2007 | 9,098 | 9,193 | 2008 | 9,056 | 9,198 | 2009 | 8,967 | 9,280 | 2010 | 8,922 | 9,454 | 2011 | 9,161 | NA | 2012 | 9,197 | NA | 2013 | 9,275 | NA | 2014 | 9,395 | NA | 2015 | 9,475 | NA | 2016 | 9,569 | NA | 2017 | 9,669 | NA | 2018 | 9,763 | NA | 2019 | 9,861 | NA | 2020 | 9,960 | NA | 2021 | 10,058 | NA |
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