2021

8.4

2000

8.0

1990

8.1

2008

7.6

1976

7.0

2015

7.5

1963

7.8

1984

7.5

2015

6.7

1970

6.1

1998

6.8

2015

7.7

2010

8.2

2016

6.7

1995

6.4

1993

6.3

2014

6.6

2015

7.3

1978

7.2

2012

6.8