Table 4: The productivity at each period.

LR fitted result

10.583
20.715
30.983
41.193 0.1760.035
51.200 0.1830.073
61.330 0.2860.099
71.309 0.2700.118
81.139 0.1300.132
91.168 0.1560.142
101.199 0.1820.151
111.149 0.1390.158
120.983 0.164
130.999 0.169
141.069 0.0670.173