|   年份  |       A  |       B  |       C  |       相关系数  |    
|   1970  |       −7.29  |       9.80  |       676.67  |       0.93  |    
|   1971  |       −6.32  |       14.07  |       436.02  |       0.99  |    
|   1972  |       −3.00  |       6.43  |       225.98  |       0.99  |    
|   1973  |       0.03  |       6.90  |       −167.28  |       0.89  |    
|   1974  |       −2.65  |       5.78  |       190.60  |       0.99  |    
|   1975  |       −2.05  |       5.50  |       120.49  |       0.99  |    
|   1976  |       −1.54  |       4.40  |       84.11  |       0.99  |    
|   1977  |       −1.52  |       4.26  |       88.33  |       0.99  |    
|   1978  |       0.21  |       4.06  |       −116.81  |       0.89  |    
|   1979  |       −0.88  |       3.31  |       28.08  |       0.94  |    
|   1980  |       −2.16  |       4.25  |       156.41  |       0.98  |    
|   1981  |       −1.92  |       4.28  |       130.09  |       0.97  |    
|   1982  |       −0.95  |       1.92  |       72.79  |       0.97  |    
|   1983  |       −2.04  |       2.46  |       201.91  |       0.98  |