1979

6.7

1999

7.7

1987

7.3

1984

7.4

1988

5.7

1992

5.3

2019

7.9

1996

7.8

2002

7.0

1999

4.9

1999

7.1

6.7

1993

7.7

1995

7.6

1994

7.5

2010

10.0

2005

5.0

1997

3.5

2019

0.0

1991

7.8