1997

6.5

1999

6.8

1998

5.3

1981

6.2

1982

5.9

1984

6.1

1985

5.3

2001

6.8

2006

6.4

2007

5.6

2020

6.2

1997

7.1

1991

8.3

1995

6.2

1995

5.5

1996

7.5

2019

6.6

1971

6.6

2000

6.3

2022

5.7