1982 6.6726 0.0005  
1987 6.667 0.0007  
1995 6.6656 0.0009 
1995 6.6685 0.0011  
1996 6.7154 0.0008 
1996 6.6729 0.0005  
1997 6.6740 0.0007 
1998 6.6873 0.0094 
1999 6.6699 0.0007   
1999 6.6742  0.0007   
1999 6.6830  0.0011    
1999 6.6754  0.0015    
2000 6.67421 0.000092
2001 6.67559 0.00027