2011

5.5

1989

6.5

1998

5.2

2011

7.2

1988

5.8

2014

6.8

1999

6.0

1992

6.9

2015

5.5

2020

6.7

2015

6.3

1968

7.3

2006

5.8

1970

6.4

1982

6.0

2011

7.1

1965

7.4

2017

5.7

1999

6.1

2017

6.3