2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | |
---|---|---|---|---|---|---|---|---|
Tibetan Plateau | Ⅱ-3 | Ⅱ-3 | Ⅱ-3 | Ⅱ-3 | Ⅱ-3 | Ⅱ-3 | Ⅲ-3 | Ⅲ-3 |
Qinghai | Ⅱ-3 | Ⅱ-3 | Ⅱ-3 | Ⅲ-3 | Ⅲ-3 | Ⅲ-3 | Ⅲ-3 | Ⅲ-3 |
Tibet | Ⅱ-3 | Ⅱ-3 | Ⅱ-3 | Ⅱ-3 | Ⅱ-3 | Ⅱ-3 | Ⅱ-3 | Ⅲ-3 |
2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | |
Tibetan Plateau | Ⅲ-3 | Ⅲ-3 | Ⅲ-3 | Ⅲ-3 | Ⅳ-3 | Ⅳ-3 | Ⅳ-2 | Ⅳ-2 |
Qinghai | Ⅲ-3 | Ⅲ-3 | Ⅳ-2 | Ⅳ-2 | Ⅳ-2 | Ⅳ-2 | Ⅳ-1 | Ⅳ-1 |
Tibet | Ⅲ-3 | Ⅲ-3 | Ⅲ-3 | Ⅲ-3 | Ⅳ-3 | Ⅳ-3 | Ⅳ-3 | Ⅳ-3 |