Plot Fitting formula R2 Intersection coordinate Stability index
2003 y = -0.0108x2 + 1.9364x + 12.686 0.99 (33.98, 66.02) 5.06
1983 y = -0.0115x2 + 1.8767x + 23.604 0.94 (30.20, 69.80) 6.93
1979 y = -0.0126x2 + 2.0686x + 14.552 0.98 (32.07, 67.93) 5.86
Low y = -0.0129x2 + 2.0761x + 16.495 0.97 (31.24, 68.76) 6.29
Medium y = -0.0102x2 + 1.7441x + 23.978 0.97 (31.36, 68.64) 6.22
High y = -0.0145x2 + 2.2532x + 13.357 0.96 (30.88, 69.12) 6.50