CTE产生意外结果

Question

我想要每个人的销售总额的百分比。我希望每个SalesPersonID有4条记录，每年有1条。我每个SalesPersonID都有16条记录。总计结果显示每年有四个不同的金额。当我单独运行查询时，它会得到正确的结果。

WITH gt as (
  Select sum(subtotal + taxamt) as YearlyGrandTotal
    , YEAR(OrderDate) as gtYear
  From AdventureWorks2017.Sales.SalesOrderHeader
  group by YEAR(OrderDate)
),
it as (
  Select SalesPersonID, sum(subtotal + taxamt) as IndividualSales 
    , year(OrderDate) as SalesYear
  From AdventureWorks2017.Sales.SalesOrderHeader
  where SalesPersonID is not null
  Group by SalesPersonID, year(OrderDate)
)
Select SalesPersonID,SalesYear, IndividualSales,YearlyGrandTotal
  , 100*(IndividualSales/YearlyGrandTotal) as PercentageTotalRevenue
From gt,it
Group by SalesYear,SalesPersonID,IndividualSales,YearlyGrandTotal
order by SalesPersonID;