| Year | Outward DI to the mainland of China | Outward DI of Hong Kong | The ratio (%) | Inward DI from the mainland of China | Inward DI of Hong Kong | The ratio (%) |
| 1998 | 534.3 | 1668.8 | 32.0 | 205.9 | 1627.2 | 12.7 |
| 1999 | 608.1 | 2448.1 | 24.8 | 805.6 | 3026.5 | 26.6 |
| 2000 | 991.2 | 2956.9 | 33.5 | 1095.0 | 3394.5 | 32.3 |
| 2001 | 812.4 | 2711.6 | 30.0 | 928.0 | 3128.1 | 29.7 |
| 2002 | 812.4 | 2391.1 | 34.0 | 571.1 | 2456.9 | 23.2 |
| 2003 | 899.6 | 2691.2 | 33.4 | 747.2 | 2823.3 | 26.5 |
| 2004 | 1161.4 | 3173.2 | 36.6 | 979.5 | 3319.7 | 29.5 |
| 2005 | 1425.9 | 3691.7 | 38.6 | 1222.0 | 3828.9 | 31.9 |
| 2006 | 2055.7 | 5289.0 | 38.9 | 1967.6 | 5469.9 | 36.0 |
| 2007 | 3363.8 | 8028.1 | 41.9 | 3677.3 | 8955.3 | 41.1 |
| 2008 | 2552.7 | 5955.5 | 42.9 | 2250.9 | 6070.6 | 37.1 |
| 2009 | 2682.2 | 6508.6 | 41.2 | 2603.6 | 7013.3 | 37.1 |
| 2010 | 3014.7 | 7338.6 | 41.1 | 3127.1 | 8299.4 | 37.7 |
| 2011 | 3346.4 | 7946.4 | 42.1 | 3042.8 | 8377.0 | 36.3 |
| 2012 | 3671.1 | 9010.2 | 40.7 | 3568.3 | 9646.6 | 37.0 |
| 2013 | 3952.3 | 9619.7 | 41.1 | 3341.6 | 10,482.9 | 31.9 |
| 2014 | 4560.0 | 11,246.9 | 40.5 | 3493.5 | 11,602.9 | 30.1 |