anchor.diff:          <Row>
             <Cell><Data ss:Type="String">Fiscal Year</Data></Cell>
             <Cell><Data ss:Type="String">Transit Agency</Data></Cell>
  +          <Cell><Data ss:Type="String">Category</Data></Cell>
  +          <Cell><Data ss:Type="String">Class</Data></Cell>
             <Cell><Data ss:Type="String">Type</Data></Cell>
             <Cell><Data ss:Type="String">Sub Type</Data></Cell>
             <Cell><Data ss:Type="String">Count</Data></Cell>
  
positive.code:           <Cell><Data ss:Type="String">Replacement Cost</Data></Cell>
          </Row>
          <% total_book_val = total_repl_cost = total_count = 0 %>
          <% @data.assets.to_a.group_by(&:asset_subtype).each do |ast, assets| %>
            <% assets.group_by(&:organization).each do |org, assets_by_org| %>
              <Row>
                <Cell><Data ss:Type="String"><%= format_as_fiscal_year(@data.fy) %></Data></Cell>
                <Cell><Data ss:Type="String"><%= org %></Data></Cell>
                <Cell><Data ss:Type="String"><%=  ast.asset_type %></Data></Cell>
                <Cell><Data ss:Type="String"><%=  ast %></Data></Cell>
                <% subtype_count = assets_by_org.count %>
                <% total_count += subtype_count %>
                <Cell><Data ss:Type="Number"><%=  subtype_count %></Data></Cell>
                <% book_val_for_ast = assets_by_org.sum{ |a| a.book_value.to_i } %>
                <% total_book_val += book_val_for_ast %>
                <Cell><Data ss:Type="Number"><%= book_val_for_ast %></Data></Cell>
                <% repl_cost_for_ast = assets_by_org.sum{ |a| a.scheduled_replacement_cost.to_i } %>
                <% total_repl_cost += repl_cost_for_ast %>
                <Cell><Data ss:Type="Number"><%= repl_cost_for_ast %></Data></Cell>
              </Row>
            <% end %>
          <% end %>
          <Row>
            <Cell><Data ss:Type="String"></Data></Cell>
  
negative.code:       <Row>
          <Cell><Data ss:Type="String">Fiscal Year</Data></Cell>
          <Cell><Data ss:Type="String">Agency</Data></Cell>
          <Cell><Data ss:Type="String">Category</Data></Cell>
          <Cell><Data ss:Type="String">Class</Data></Cell>
          <Cell><Data ss:Type="String">Type</Data></Cell>
          <Cell><Data ss:Type="String">Asset Subtype</Data></Cell>
          <Cell><Data ss:Type="String">Asset Tag</Data></Cell>
          <Cell><Data ss:Type="String">Description</Data></Cell>
  