1955

6.0

1977

7.4

1997

6.7

2007

6.8

1979

8.2

1982

8.1

2001

7.2

1990

6.3

1989

5.7

1998

6.4

2023

8.0

2005

10.0

1989

2.9

1996

6.4

2005

6.5

1987

7.5

2007

5.2

1997

1.3

1997

7.7

2014

3.0