| Year | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 
| TCD of Hong Kong to Mainland China | 10.53 | 9.09 | 7.53 | 7.16 | 6.71 | 5.79 | 4.93 | 4.78 | 
| TCD of Mainland China to Hong Kong | 15.72 | 16.54 | 14.36 | 13.11 | 11.13 | 9.35 | 8.27 | 7.67 | 
| Year | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 
| TCD of Hong Kong to Mainland China | 4.21 | 4.28 | 4.17 | 4.24 | 3.84 | 4.02 | 4.07 | 4.21 | 
| TCD of Mainland China to Hong Kong | 7.09 | 6.41 | 6.19 | 6.10 | 5.35 | 5.08 | 4.70 | 4.28 |