1981

7.9

1990

7.6

2011

8.2

2023

9.7

2005

7.1

2003

7.3

1976

7.8

2011

7.2

2009

7.0

2003

6.5

1979

6.8

2015

7.5

1997

6.4

2005

7.1

2005

7.8

2011

7.5

2015

7.6

1994

7.2

1987

7.5

2005

7.0