1997

4.0

2007

2.8

1997

1.0

1992

6.0

1986

5.0

1993

6.2

1970

4.8

2003

5.8

1986

5.3

1997

3.2

2000

5.6

1973

5.3

2016

7.1

2009

6.6

2020

5.4

1977

2.0

2009

2.7

2004

3.5

1998

4.0

1973

4.6