| year | Import and export trade size | A moving average | Second moving average |
| 2000 | 3.9 | 0 | 0 |
| 2001 | 4.2 | 0 | 0 |
| 2002 | 5.1 | 4.40 | 0 |
| 2003 | 7.0 | 5.43 | 0 |
| 2004 | 9.6 | 7.23 | 5.69 |
| 2005 | 11.7 | 9.43 | 7.37 |
| 2006 | 14.1 | 11.80 | 9.49 |
| 2007 | 16.7 | 14.17 | 11.80 |
| 2008 | 18.0 | 16.27 | 14.08 |
| 2009 | 15.1 | 16.60 | 15.68 |
| 2010 | 20.2 | 17.77 | 16.88 |
| 2011 | 23.6 | 19.63 | 18.00 |
| 2012 | 24.4 | 22.73 | 20.04 |
| 2013 | 25.8 | 24.60 | 22.32 |
| 2014 | 26.4 | 25.53 | 24.29 |
| 2015 | 0 | 0 | 28.01 |
| 2016 | 0 | 0 | 29.25 |