Figure 4

The histogram about three components about PSR framework in 2000 and 2010. (a) histogram about pressure in 2000. (b) Histogram about status in 2000. (c) Histogram about response in 2000. (d) Histogram about pressure in 2010. (e) Histogram about status in 2010. (f) Histogram about response in 2010. Figures were generated with R langauge program 3.1.3.