2005

6.8

2023

6.5

1975

8.0

1998

7.0

2015

6.3

1985

6.1

1985

6.9

2017

5.7

2000

4.5

2020

6.3

2018

10.0

2019

6.9

2004

6.7

2003

6.6

1977

7.2

1973

7.9

2004

7.0

1993

7.8

1987

7.3

2018

5.6