Display data from multiple select statements

Need to be able to query an SQL Database for sales figures from 2013,2014,2015, and 1/1/2016 to 8/30/2016
Ideally I would like to get in return the following columns:
slsperid,CustId, Name, TotalPurch2013,TotalPurch2014,TotalPurch2015,TotalPurch2016

Here is the query I normally would use to return:
slsperid,CustId, Name, TotalPurch

Query:

select b.custid,
b.SlsperId,
B.name,
sum(a.TotInvc) as TotalPurch

from SOShipHeader a,Customer b
where a.custid=B.custid
and a.InvcDate>='1/1/2015'
and a.InvcDate<='12/31/2015'
and a.Status ='C'
and a.cancelled<>'1'
and b.SlsperID like '%'
and a.CustId>='a'
group by b.custid,b.SlsperId,B.name,b.phone,b.fax,b.ClassId
order by b.custid

Your assistance in formatting this query to get the return data set would be greatly appreciated.