| Year | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 |
| Actual value | 86,602 | 85,740 | 98,723 | 95,255 | 114,919 | 110,358 | 152,132 | 177,765 | 168,875 |
| Model value | 95,941 | 102,247 | 108,967 | 116,129 | 123,762 | 131,896 | 140,566 | 149,804 | 159,651 |
| Error value | −0.1078 | −0.1925 | −0.1038 | −0.2191 | −0.0769 | −0.1952 | 0.0760 | 0.1573 | 0.0546 |
| Year | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 |
|
| Actual value | 204,668 | 200,080 | 191,779 | 193,718 | 217,255 | 235,493 | 242,175 | 245,384 |
|
| Model value | 170,144 | 181,327 | 193,245 | 205,946 | 219,482 | 233,908 | 249,282 | 265,667 |
|
| Error value | 0.1687 | 0.0937 | −0.0076 | −0.0631 | −0.0103 | 0.0067 | −0.0293 | −0.0827 |
|