2015

8.1

1979

6.8

1990

6.9

1966

8.0

2004

7.7

1987

7.8

1994

8.0

2004

7.9

1999

7.0

2019

7.5

1997

6.6

1981

7.0

2001

7.8

2002

8.3

2005

7.2

1977

7.4

2001

7.6

1995

7.2

2017

8.1

2005

8.6