1989

7.8

1986

7.1

1990

7.5

1996

7.3

1984

7.7

2015

7.5

2016

3.0

1995

7.6

1985

8.3

1962

7.9

2016

6.8

1979

6.2

2014

6.0

2017

0.0

2015

6.5

2015

0.0

2019

7.2

1997

6.6

1999

6.3

2002

6.0