| Year | No. of Programs | Reference | No. of Uni. | Reference | % |
| 2001 | 13 | (Zhu & Zhao 2001) | 597 | (EDU 2002) | 2.18% |
| 2002 | 96 | (Feng & Ling 2002) | 629 | (EDU 2002a) | 15.26% |
| 2003 | 153 | (Zhang 2004) | 642 | (EDU 2003) | 23.83% |
| 2004 | 217 | (Gide and Wu 2005) | 645 | (EDU 2004) | 33.64% |
| 2005 | 275 | (MOE 2005) | 700 | (EDU 2005) | 39.29% |
| 2006 | 306 | (Zhang 2007) | 719 | (EOL 2006) | 42.56% |
| 2007 | 324 | (EC Education Committee 2008) | 742 | (EOL 207) | 43.67% |
| 2008 | 327 | (Chen 2010) | 755 | (MOE 2008) | 43.31% |
| 2009 | 339 | (EC Education Committee 2010) | 770 | (Xinhuanet 2009) | 44.03% |
| 2010 | 339 | BAIDU (n.d.) | 792 | (MOE 2010) | 42.80% |
| 2011 | 205 | (NSEAC 2012) | 820 | (MOE 2011) | 25.00% |
| 2012 | 244 | (360doc 2013, NSEAC 2013) | 844 | (MOE 2012) | 28.91% |
| 2013 | 267 | (NSEAC 2014) | 879 | (MOE 2013) | 30.38% |
| 2014 | 291 | (66CV 2015) | 776 | (Xinhuanet 2014) | 37.50% |
| 2015 | 274 |
| 796 | (EOL 2015) | 34.42% |