1997

7.3

1997

7.1

1985

7.8

1990

6.9

1998

6.9

1991

7.4

2011

6.1

1965

7.5

1955

7.7

2005

8.3

2015

7.8

1997

7.3

1989

6.8

2020

7.6

2003

8.2

2017

7.8

1969

7.8

2001

8.6

2011

5.9

1998

7.0