2002

6.1

1997

7.4

1998

7.2

1974

6.6

1989

5.8

2009

5.9

1976

5.5

2019

7.1

1992

4.5

2016

7.7

2003

6.2

1999

6.2

1982

7.5

1997

7.7

1994

6.2

2005

6.3

1989

6.0

1959

8.0

1974

8.6

1990

7.4