Sample distribution of A+H share companies by year and industry
| Industry | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 |
|---|---|---|---|---|---|---|---|
| Mining | 5 | 7 | 7 | 7 | 7 | 8 | 8 |
| Manufacturing | 21 | 24 | 24 | 27 | 30 | 36 | 36 |
| Utilities | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| Construction | 1 | 2 | 3 | 3 | 3 | 4 | 4 |
| Transportation | 10 | 10 | 11 | 12 | 12 | 12 | 12 |
| IT | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Wholesale and retail | 0 | 0 | 0 | 0 | 1 | 1 | 1 |
| Financial | 8 | 8 | 10 | 11 | 13 | 14 | 14 |
| Real estate | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Social services | 1 | 1 | 1 | 1 | 1 | 2 | 2 |
| Total | 51 | 57 | 61 | 66 | 72 | 82 | 82 |
| Industry | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 |
|---|---|---|---|---|---|---|---|
| Mining | 5 | 7 | 7 | 7 | 7 | 8 | 8 |
| Manufacturing | 21 | 24 | 24 | 27 | 30 | 36 | 36 |
| Utilities | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| Construction | 1 | 2 | 3 | 3 | 3 | 4 | 4 |
| Transportation | 10 | 10 | 11 | 12 | 12 | 12 | 12 |
| IT | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Wholesale and retail | 0 | 0 | 0 | 0 | 1 | 1 | 1 |
| Financial | 8 | 8 | 10 | 11 | 13 | 14 | 14 |
| Real estate | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Social services | 1 | 1 | 1 | 1 | 1 | 2 | 2 |
| Total |
Note(s): Sample period covers from January 1, 2007, to September 30, 2013
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