1994

5.7

2003

7.2

2006

6.6

2003

8.3

2004

6.3

1997

6.5

1992

7.4

1990

6.7

2006

6.3

1980

5.1

1999

7.1

2017

5.3

2007

5.3

1976

2.0

1994

7.4

1991

7.1

2019

6.4

1980

4.8

1975

5.8

2016

4.5