1.直接作图
clear,clc
years=[1982,1983,1984,1985,1986,1987,1988,1989,1990,
1991,1992,1993,1994,1995,1996,1997,1998,1999,2000,20
01,2002]';
x1=[103777,107758,118886,202394,295136,298147,276071
,258030,250297,264817,228278,242343,253537,271843,28
7685,304217,346129,412860,616974,754919,773137]';
plot(years,x1)