To View CPU Utilization History

DECLARE @ts BIGINT;
DECLARE @lastNmin BIGINT;
SET @lastNmin = 60;
SELECT @ts =(SELECT cpu_ticks/(cpu_ticks/ms_ticks) FROM sys.dm_os_sys_info);
SELECT TOP(@lastNmin)
 SQLProcessUtilization AS [SQLServer_CPU_Utilization],
 SystemIdle AS [System_Idle_Process],
 100 - SystemIdle - SQLProcessUtilization AS [Other_Process_CPU_Utilization],
 DATEADD(ms,-1 *(@ts - [timestamp]),GETDATE())AS [Event_Time]
FROM (SELECT record.value('(./Record/@id)[1]','int')AS record_id,
record.value('(./Record/SchedulerMonitorEvent/SystemHealth/SystemIdle)[1]','int')AS [SystemIdle],
record.value('(./Record/SchedulerMonitorEvent/SystemHealth/ProcessUtilization)[1]','int')AS [SQLProcessUtilization],
[timestamp]
FROM (SELECT[timestamp], convert(xml, record) AS [record]
FROM sys.dm_os_ring_buffers
WHERE ring_buffer_type =N'RING_BUFFER_SCHEDULER_MONITOR'AND record LIKE'%%')AS x )AS y
ORDER BY record_id DESC;