How to provide a same value for consecutive years, and so on?

[KS99]

Hi all, 

Thank you in advance, 

I have a panel data like the following: 

ID CUSIP YEAR
2 201647 1994
3 20030N 1987
3 20030N 1988
3 20030N 1989
3 20030N 1991
3 20030N 1996
3 20030N 1997
3 20030N 1998
4 073902 1992
4 073902 1993
6 561232 1995
8 552848 2002
8 552848 2004
8 552848 2007
8 62945J 1987
8 62945J 1988
8 929903 1991
8 929903 1992
8 929903 1994
12 08658U 1995
12 08658U 1996
12 08658U 1997
13 001547 2007
13 001547 2008
13 001547 2011
13 001547 2012
13 001547 2014 

By group ID-CUSIP, I want to endow a same value for consecutive years. And, if there is a jump in year, consecutive years from that year on will be endowed another yet same value. 

The results I want to obtain are: 

ID CUSIP YEAR Newvar
2 201647 1994      1
3 20030N 1987     1
3 20030N 1988     1
3 20030N 1989     1
3 20030N 1991     2
3 20030N 1996     3
3 20030N 1997     3
3 20030N 1998     3
4 073902 1992     1
4 073902 1993     1
6 561232 1995     1
8 552848 2002    1
8 552848 2004    2
8 552848 2007    3
8 62945J 1987    1
8 62945J 1988    1
8 929903 1991    1
8 929903 1992    1
8 929903 1994    2
12 08658U 1995  1
12 08658U 1996  1
12 08658U 1997  1
13 001547 2007  1
13 001547 2008  1
13 001547 2011  2
13 001547 2012  2
13 001547 2014  3

I sincerely thank you all for your wonderful help! 

KS -, 

[Kurt_Bremser · Accepted solution]

data want;
set have;
by id notsorted;
if first.id
then newvar = 1;
if not first.id and lag(year) lt year - 1 then newvar + 1;
run;

[KS99]

Thank you. Sir, for helping out.
It works wonderfully!

KS -,