1989

7.7

1995

6.3

2019

6.9

2007

6.7

2007

8.1

1998

8.3

1997

7.9

1995

8.1

2002

6.9

2001

5.6

1964

7.5

1991

6.4

1941

6.6

1984

6.1

1982

6.7

1935

5.3

1997

7.2

2002

6.4

2004

6.5

2003

5.6