1990

6.0

2021

5.0

2020

4.2

1997

4.3

2000

5.7

2018

6.8

1975

3.0

1997

6.1

2014

5.9

2018

6.3

1958

5.7

1979

5.8

1988

6.8

2001

7.1

1995

5.5

2001

6.4

2005

5.2

2003

6.2

1998

5.6

1997

7.1