1998

6.7

2004

7.2

2005

6.0

1993

6.2

1986

7.6

2021

6.9

2011

0.0

2018

6.8

2019

5.9

1980

6.4

2000

5.0

2007

6.7

2007

7.3

1973

7.5

1994

6.1

2007

7.6

1987

6.0

1973

7.1

1968

6.4

1967

6.0