1999

4.8

2009

5.0

2003

6.0

1980

6.1

2010

6.6

2010

6.3

2007

5.2

2013

7.5

1990

6.0

2023

7.7

1987

6.9

1979

7.6

1985

6.7

2016

6.9

2015

7.1

2022

6.0

2009

4.6

1976

7.9

1975

6.5

1992

6.1