1999

6.5

1996

7.3

2006

6.9

2021

8.2

1976

0.0

2019

7.6

2020

7.4

2007

6.6

2015

6.8

1990

8.3

2002

7.6

2020

7.8

2013

7.9

2006

7.4

1992

7.5

1995

7.3

1998

8.0

1972

6.5

1967

7.7

1993

6.6