2001

8.1

1999

7.6

2006

6.1

2005

8.8

2000

6.2

2014

8.3

2014

7.0

2017

10.0

2005

7.3

2002

8.2

2020

2.0

1987

6.4

2021

0.0

1979

6.9

1983

0.0

1990

7.8

1995

7.7

1968

7.3

1999

7.7

2001

7.6