diff --git a/src/company_base.h b/src/company_base.h
--- a/src/company_base.h
+++ b/src/company_base.h
@@ -92,7 +92,7 @@ struct CompanyProperties {
 	 */
 	bool is_ai;
 
-	Money yearly_expenses[3][EXPENSES_END];                ///< Expenses of the company for the last three years, in every #ExpensesType category.
+	std::array<Expenses, 3> yearly_expenses{}; ///< Expenses of the company for the last three years.
 	CompanyEconomyEntry cur_economy;                       ///< Economic data of the company of this quarter.
 	CompanyEconomyEntry old_economy[MAX_HISTORY_QUARTERS]; ///< Economic data of the company of the last #MAX_HISTORY_QUARTERS quarters.
 	byte num_valid_stat_ent;                               ///< Number of valid statistical entries in #old_economy.
diff --git a/src/company_cmd.cpp b/src/company_cmd.cpp
--- a/src/company_cmd.cpp
+++ b/src/company_cmd.cpp
@@ -750,8 +750,9 @@ static IntervalTimer<TimerGameCalendar> 
 {
 	/* Copy statistics */
 	for (Company *c : Company::Iterate()) {
-		memmove(&c->yearly_expenses[1], &c->yearly_expenses[0], sizeof(c->yearly_expenses) - sizeof(c->yearly_expenses[0]));
-		memset(&c->yearly_expenses[0], 0, sizeof(c->yearly_expenses[0]));
+		/* Move expenses to previous years. */
+		std::rotate(std::rbegin(c->yearly_expenses), std::rbegin(c->yearly_expenses) + 1, std::rend(c->yearly_expenses));
+		c->yearly_expenses[0] = {};
 		SetWindowDirty(WC_FINANCES, c->index);
 	}
 
diff --git a/src/company_gui.cpp b/src/company_gui.cpp
--- a/src/company_gui.cpp
+++ b/src/company_gui.cpp
@@ -229,7 +229,7 @@ static void DrawPrice(Money amount, int 
  * Draw a category of expenses/revenues in the year column.
  * @return The income sum of the category.
  */
-static Money DrawYearCategory (const Rect &r, int start_y, ExpensesList list, const Money(&tbl)[EXPENSES_END])
+static Money DrawYearCategory(const Rect &r, int start_y, ExpensesList list, const Expenses &tbl)
 {
 	int y = start_y;
 	ExpensesType et;
@@ -260,7 +260,7 @@ static Money DrawYearCategory (const Rec
  * @param tbl  Reference to table of amounts for \a year.
  * @note The environment must provide padding at the left and right of \a r.
  */
-static void DrawYearColumn(const Rect &r, TimerGameCalendar::Year year, const Money (&tbl)[EXPENSES_END])
+static void DrawYearColumn(const Rect &r, TimerGameCalendar::Year year, const Expenses &tbl)
 {
 	int y = r.top;
 	Money sum;
diff --git a/src/economy_type.h b/src/economy_type.h
--- a/src/economy_type.h
+++ b/src/economy_type.h
@@ -173,6 +173,11 @@ enum ExpensesType : byte {
 };
 
 /**
+ * Data type for storage of Money for each #ExpensesType category.
+ */
+using Expenses = std::array<Money, EXPENSES_END>;
+
+/**
  * Categories of a price bases.
  */
 enum PriceCategory {
diff --git a/src/network/network_admin.cpp b/src/network/network_admin.cpp
--- a/src/network/network_admin.cpp
+++ b/src/network/network_admin.cpp
@@ -383,10 +383,7 @@ NetworkRecvStatus ServerNetworkAdminSock
 {
 	for (const Company *company : Company::Iterate()) {
 		/* Get the income. */
-		Money income = 0;
-		for (uint i = 0; i < lengthof(company->yearly_expenses[0]); i++) {
-			income -= company->yearly_expenses[0][i];
-		}
+		Money income = -std::reduce(std::begin(company->yearly_expenses[0]), std::end(company->yearly_expenses[0]));
 
 		Packet *p = new Packet(ADMIN_PACKET_SERVER_COMPANY_ECONOMY);