历年	道格拉斯模型	相关系数R	方差F
1978	C = 0.0028t ^0.23341f ^0.36330s ^0.70173	0.965^**	45.82^**
1980	C = 0.0027t ^0.23341f ^0.36330s ^0.70173	0.965^**	45.82^**
1985	C = 0.0037t ^0.23341f ^0.36330s ^0.70173	0.965^**	45.82^**
1990	C = 0.0057t ^0.23341f ^0.36330s ^0.70173	0.965^**	45.82^**
1995	C = 4.0281t ^0.18794f ^0.61008s ^0.15656	0.952^**	32.56^**
1996	C = 6.1840t ^0.18610f ^0.68156s ⁰¹¹⁷¹⁷	0.962^**	42.14^**
1997	C = 3.9410t ^0.18193f ^0.63657s ^0.15498	0.963^**	42.99^**
1998	C = 9.6907t ^0.15554f ^0.68564s ^0.15600	0.963^**	42.64^**
1999	C = 2.4746t ^0.14514f ^0.60010s ^0.21411	0.958^**	37.29^**
2000	C = 0.8746t ^0.20535f ^0.60787s ^0.29042	0.969^**	50.73^**
2001	C = 1.2356t ^0.19814f ^0.64050s ^0.26160	0.975^**	65.28^**
2002	C = 4.1323t ^0.15684f ^0.73773s ^0.17627	0.978^**	71.88^**
2003	C = 1.0536t ^0.19754f ^0.64403s ^0.28908	0.980^**	84.55^**
2004	C = 0.9418t ^0.16506f ^0.66942s ^0.29851	0.981^**	83.82^**
2005	C = 1.7747t ^0.16085f ^0.71011s ^0.24266	0.981^**	81.13^**
2006	C = 1.3713t ^0.16014f ^0.69626s ^0.26767	0.981^**	83.38^**
2007	C = 0.7703t ^0.15527f ^0.68863s ^0.30271	0.980^**	79.33^**
2008	C = 0.0076t ^0.23341f ^0.36330s ^0.70173	0.965^**	45.82^**
2009	C = 0.0061t ^0.21359f ^0.27630s ^0.74836	0.964^**	43.80^**
2010	C = 0.0121t ^0.19875f ^0.33147s ^0.68504	0.962^**	40.91^**
2011	C = 0.0109t ^0.19108f ^0.34600s ^0.69342	0.967^**	48.28^**
2012	C = 0.0113t ^0.18605f ^0.38814s ^0.67519	0.957^**	36.43^**
2013	C = 0.0118t ^0.18605f ^0.38814s ^0.67519	0.957^**	36.43^**
2014	C = 0.0123t ^0.18605f ^0.38814s ^0.67519	0.957^**	36.43^**
2015	C = 0.0128t ^0.18605f ^0.38814s ^0.67519	0.957^**	36.43^**
2016	C = 0.0140t ^0.18605f ^0.38814s ^0.67519	0.957^**	36.43^**
2017	C = 0.0137t ^0.18605f ^0.38814s ^0.67519	0.957^**	36.43^**
2018	C = 0.0134t ^0.18605f ^0.38814s ^0.67519	0.957^**	36.43^**
2019	C = 0.0131t ^0.18605f ^0.38814s ^0.67519	0.957^**	36.43^**
2020	C = 0.0141t ^0.18605f ^0.38814s ^0.67519	0.957^**	36.43^**
综合平均	C = 0.0437t ^0.19327f ^0.48707s ^0.55183	0.986^**	49.31^**